Demographics
Timeline: Key Events in U.S. History that Defined Generations

Introducing our new index, which ranks U.S. generations on their economic, political, and cultural influence.

Key Events in U.S. History that Defined Generations
Looking back at history is a necessity when trying to understand what the future may hold.
Using insights from our Generational Power Index 2021 report, along with survey data from Pew Research in 2016, we identified some key milestones for each cohort, to understand how these events helped shape each generation’s unique perspectives.
Quick Context on Generational Definitions
Before diving in, it’s important to clarify which generations we’ve included in our research, along with their age and birth year ranges.
Generation | Age range (years) | Birth year range |
---|---|---|
The Silent Generation | 76 and over | 1928-1945 |
Baby Boomers | 57-75 | 1946-1964 |
Gen X | 41-56 | 1965-1980 |
Millennials | 25-40 | 1981-1996 |
Gen Z | 9-24 | 1997-2012 |
Gen Alpha | 8 and below | 2013-present |
These generational categories aren’t universal, but we went with the most widely cited definitions from reputable U.S. sources including the Pew Research and the U.S. Federal Reserve. It’s also worth noting that these generational definitions are somewhat specific to North America. For this reason, the focus is on U.S. historic events.
Defining Events: Silent Generation
The oldest members of the Silent Generation were 11 years old at the start of World War II, and were teenagers by the time it ended. In other words, their formative years fell smack dab in the middle of one of the biggest international conflicts in modern history.
Because of this, it makes sense that World War II ranks as the second most impactful event in their lifetimes, trailing only the far more recent Sept. 11 terrorist attacks (2001).
Most Impactful Historic Events, Silent Gen (Survey Results)
Rank | Silent Gen | Survey % |
---|---|---|
#1 | Sept. 11 | 59% |
#2 | WWII | 44% |
#3 | JFK Assassination | 41% |
#4 | Vietnam War | 37% |
#5 | Moon landing | 29% |
#6 | Obama election | 28% |
#7 | The tech revolution | 27% |
#8 | Civil rights movement | 18% |
#9 | Korean War | 18% |
#10 | Iraq/Afghanistan wars | 14% |
In fact, the Silent Generation cited four different wars on their list, more than any other cohort. For context, Boomers identified three conflicts (including the Cold War), while Millennials only referenced one (Iraq/Afghanistan).
Of course, other not-so-violent events made the list as well. And interestingly, some of these impressionable moments occurred later on in life.
For example, the youngest members of The Silent Generation were already in their mid-t0-late forties when cellphones became common in the ‘90s—yet, 27% identified the tech revolution as one of the top 10 most impactful events that happened in their lifetime.
Clearly, life never stops throwing you curve balls—no matter how far along you might be.
Most Notable Historical Events: Baby Boomers
Many of the historical experiences cited by Baby Boomers were related to war and violent acts. For instance, Boomers identified two assassinations on their list—John F. Kennedy’s in 1963, and Martin Luther King’s in 1968.
Most Impactful Historic Events, Boomers (Survey Results)
Rank | Baby Boomers | Survey % |
---|---|---|
#1 | Sept. 11 | 70% |
#2 | JFK Assassination | 45% |
#3 | Vietnam War | 41% |
#4 | Obama election | 38% |
#5 | Moon landing | 35% |
#6 | The tech revolution | 26% |
#7 | Civil rights movement | 18% |
#8 | Fall of Berlin Wall/end of Cold War | 16% |
#9 | MLK assassination | 15% |
#10 | Iraq/Afghanistan wars | 11% |
For this generation, the moon landing in 1969 made the cut, as did Barack Obama’s election win in 2008.
Baby Boomers only identified one event that was unique to their cohort (Martin Luther King’s death). It’s worth noting that responses varied between Americans of different racial backgrounds. Not surprisingly, Black Americans were far more likely to name MLK’s death as a top defining moment.
Most Notable Historical Events: Gen X
For Gen Xers, two unique events made their list: the Challenger disaster (1986) and the Gulf War (1991). Interestingly, neither of of these events stood out for other generations.
The Challenger disaster impact was widely felt because it involved civilians alongside astronauts, making the space shuttle’s explosion all the more notorious.
Most Impactful Historic Events, Gen Xers (Survey Results)
Rank | Gen X | Survey % |
---|---|---|
#1 | Sept. 11 | 79% |
#2 | Obama election | 40% |
#3 | Fall of Berlin Wall/end of Cold War | 21% |
#4 | The tech revolution | 20% |
#5 | Iraq/Afghanistan wars | 18% |
#6 | Gulf War | 15% |
#7 | Challenger disaster | 14% |
#8 | Gay marriage | 10% |
#9 | Hurricane Katrina | 10% |
#10 | Columbine shooting | 9% |
#11 | Orlando shooting | 9% |
#12 | Oklahoma City bombing | 9% |
Hurricane Katrina (which occurred in 2005) is the only natural disaster to make it on any of these lists. The hurricane—which caused a significant share of New Orleans’ population to resettle—left a lasting impression on the nation.
Most Notable Historical Events: Millennials
Millennials remember the September 11 attacks the most of all generations, with 86% citing it as their most influential event. They also paid close attention to the aftermath of this occurrence, as marked by the inclusion of both the Iraq/Afghanistan wars and the death of Osama Bin Laden among their most notable events.
Most Impactful Historic Events, Millennials (Survey Results)
Rank | Millennials | Survey % |
---|---|---|
#1 | Sept.11 | 86% |
#2 | Obama election | 47% |
#3 | Iraq/Afghanistan wars | 24% |
#4 | Gay marriage | 19% |
#5 | The tech revolution | 18% |
#6 | Orlando shooting | 17% |
#7 | Hurricane Katrina | 11% |
#8 | Columbine shooting | 10% |
#9 | Bin Laden | 10% |
#10 | Sandy Hook | 7% |
#11 | Boston Marathon bombing | 7% |
#12 | Great Recession | 7% |
Sadly, a lot of Millennials recollect instances of gun violence more than any other generation, from Orlando and Columbine to Sandy Hook.
Last but not least, Millennials are the only generation to note the Global Financial Crisis of 2008, and the subsequent Great Recession, as a momentous event. This makes sense considering many of them began their careers in its aftermath.
Gen Z and Younger
The Pew Research survey data was collected in 2016, so opinions on more recent events have not been collected.
That said, it could be premature to say in the short term which events will leave a lasting impression on generations, young and old.
According to the above data, the election of Barack Obama was a lasting milestone in recent history. Will the election of Donald Trump leave a similar impact? How will COVID-19 be regarded in the future? Time will tell which events will define future generations.
Moments, Movements, and Everything in Between
One key takeaway worth emphasizing is just how varied these formative events can be. Some were experienced as a single moment, while others were a culmination of shifts over several years.
It’s also clear that timing and duration are not the only determining factors behind an event’s influence on American society. For example, the moon landing was a tangible moment with a date stamp, whereas the tech revolution has a much fuzzier start (before exploding in significance alongside the Dotcom boom and bust).
Also interesting is what is absent from the top results. For example, the Global Financial Crisis of 2008 is barely referenced.
In short, a variety of impactful events and more gradual revolutions have made their mark on American society. Some have influenced specific generations, while others have transcended generational boundaries and unified the American public.
Download the Generational Power Report (.pdf)
For a full methodology of how we built the Generational Power Index, see pages 28-30 in the report PDF. This is the first year of the report, and any feedback is welcomed.
Healthcare
Charted: Average Years Left to Live by Age
Visualizing the number of years left to live for Americans at every age, reveals the broader trends in American life expectancy.

How Many Years Do You Have Left to Live?
At the start of the 19th century, when there fewer than 1 billion humans on the earth, global life expectancy at birth stood at roughly 29 years.
This is a startlingly low figure—because life expectancy is a statistical projection of how many more years a person can expect to live, based on the mortality rates at the time. And since the infant mortality rate in particular was so high, life expectancies accurately summarized the low likelihood of many babies living to adulthood.
However, since the 1920s, life expectancy across all ages has improved leaps and bounds, thanks to rapid advancements in nutrition, healthcare, and sanitation.
We visualized the current American life expectancy by age and gender, using data from the Office of Social Security, which bases their current projections on 2020 mortality rates.
American Life Expectancy at Every Age
A key takeaway with life expectancy is that it increases as one gets older. This is easily seen in the table below, which lists the remaining years left to live at a given age for an American male and the projected life expectancy.
Age | Years Remaining (Men) | Life Expectancy (Men) |
---|---|---|
0 | 74.12 | 74.12 |
1 | 73.55 | 74.55 |
2 | 72.58 | 74.58 |
3 | 71.60 | 74.60 |
4 | 70.62 | 74.62 |
5 | 69.63 | 74.63 |
6 | 68.64 | 74.64 |
7 | 67.65 | 74.65 |
8 | 66.65 | 74.65 |
9 | 65.66 | 74.66 |
10 | 64.67 | 74.67 |
11 | 63.68 | 74.68 |
12 | 62.69 | 74.69 |
13 | 61.70 | 74.70 |
14 | 60.71 | 74.71 |
15 | 59.73 | 74.73 |
16 | 58.76 | 74.76 |
17 | 57.79 | 74.79 |
18 | 56.84 | 74.84 |
19 | 55.90 | 74.90 |
20 | 54.97 | 74.97 |
21 | 54.04 | 75.04 |
22 | 53.12 | 75.12 |
23 | 52.21 | 75.21 |
24 | 51.30 | 75.30 |
25 | 50.39 | 75.39 |
26 | 49.48 | 75.48 |
27 | 48.57 | 75.57 |
28 | 47.66 | 75.66 |
29 | 46.76 | 75.76 |
30 | 45.86 | 75.86 |
31 | 44.97 | 75.97 |
32 | 44.07 | 76.07 |
33 | 43.18 | 76.18 |
34 | 42.29 | 76.29 |
35 | 41.39 | 76.39 |
36 | 40.50 | 76.50 |
37 | 39.62 | 76.62 |
38 | 38.73 | 76.73 |
39 | 37.85 | 76.85 |
40 | 36.97 | 76.97 |
41 | 36.09 | 77.09 |
42 | 35.21 | 77.21 |
43 | 34.34 | 77.34 |
44 | 33.46 | 77.46 |
45 | 32.59 | 77.59 |
46 | 31.73 | 77.73 |
47 | 30.87 | 77.87 |
48 | 30.01 | 78.01 |
49 | 29.17 | 78.17 |
50 | 28.33 | 78.33 |
51 | 27.50 | 78.50 |
52 | 26.67 | 78.67 |
53 | 25.86 | 78.86 |
54 | 25.06 | 79.06 |
55 | 24.27 | 79.27 |
56 | 23.48 | 79.48 |
57 | 22.71 | 79.71 |
58 | 21.95 | 79.95 |
59 | 21.21 | 80.21 |
60 | 20.47 | 80.47 |
61 | 19.74 | 80.74 |
62 | 19.03 | 81.03 |
63 | 18.32 | 81.32 |
64 | 17.63 | 81.63 |
65 | 16.94 | 81.94 |
66 | 16.26 | 82.26 |
67 | 15.58 | 82.58 |
68 | 14.91 | 82.91 |
69 | 14.24 | 83.24 |
70 | 13.59 | 83.59 |
71 | 12.94 | 83.94 |
72 | 12.30 | 84.30 |
73 | 11.67 | 84.67 |
74 | 11.05 | 85.05 |
75 | 10.46 | 85.46 |
76 | 9.88 | 85.88 |
77 | 9.32 | 86.32 |
78 | 8.77 | 86.77 |
79 | 8.25 | 87.25 |
80 | 7.74 | 87.74 |
81 | 7.25 | 88.25 |
82 | 6.77 | 88.77 |
83 | 6.31 | 89.31 |
84 | 5.88 | 89.88 |
85 | 5.47 | 90.47 |
86 | 5.07 | 91.07 |
87 | 4.70 | 91.70 |
88 | 4.35 | 92.35 |
89 | 4.02 | 93.02 |
90 | 3.72 | 93.72 |
91 | 3.44 | 94.44 |
92 | 3.18 | 95.18 |
93 | 2.96 | 95.96 |
94 | 2.75 | 96.75 |
95 | 2.57 | 97.57 |
96 | 2.42 | 98.42 |
97 | 2.28 | 99.28 |
98 | 2.15 | 100.15 |
99 | 2.04 | 101.04 |
100 | 1.93 | 101.93 |
101 | 1.83 | 102.83 |
102 | 1.73 | 103.73 |
103 | 1.63 | 104.63 |
104 | 1.54 | 105.54 |
105 | 1.45 | 106.45 |
106 | 1.36 | 107.36 |
107 | 1.27 | 108.27 |
108 | 1.18 | 109.18 |
109 | 1.10 | 110.10 |
110 | 1.02 | 111.02 |
111 | 0.95 | 111.95 |
112 | 0.88 | 112.88 |
113 | 0.82 | 113.82 |
114 | 0.76 | 114.76 |
115 | 0.70 | 115.70 |
116 | 0.65 | 116.65 |
117 | 0.60 | 117.60 |
118 | 0.56 | 118.56 |
119 | 0.52 | 119.52 |
120 | 0.48 | 120.48 |
At birth, an average American baby boy can expect to live till just past 74. But if the boy reaches adulthood, then at 21 he might live to a full year more, past 75. This trend persists even towards the end of life when the years we have left drop rapidly, influenced by the higher likelihood of death.
American women, on the other hand, have a higher life expectancy than men. At birth the gap is close to six years, narrowing steadily to around one year by 85.
Age | Years Remaining (Women) | Life Expectancy (Women) |
---|---|---|
0 | 79.78 | 79.78 |
1 | 79.17 | 80.17 |
2 | 78.19 | 80.19 |
3 | 77.21 | 80.21 |
4 | 76.22 | 80.22 |
5 | 75.23 | 80.23 |
6 | 74.24 | 80.24 |
7 | 73.25 | 80.25 |
8 | 72.25 | 80.25 |
9 | 71.26 | 80.26 |
10 | 70.27 | 80.27 |
11 | 69.27 | 80.27 |
12 | 68.28 | 80.28 |
13 | 67.29 | 80.29 |
14 | 66.30 | 80.30 |
15 | 65.31 | 80.31 |
16 | 64.32 | 80.32 |
17 | 63.34 | 80.34 |
18 | 62.36 | 80.36 |
19 | 61.38 | 80.38 |
20 | 60.41 | 80.41 |
21 | 59.44 | 80.44 |
22 | 58.47 | 80.47 |
23 | 57.50 | 80.50 |
24 | 56.54 | 80.54 |
25 | 55.58 | 80.58 |
26 | 54.61 | 80.61 |
27 | 53.66 | 80.66 |
28 | 52.70 | 80.70 |
29 | 51.74 | 80.74 |
30 | 50.79 | 80.79 |
31 | 49.84 | 80.84 |
32 | 48.89 | 80.89 |
33 | 47.94 | 80.94 |
34 | 47.00 | 81.00 |
35 | 46.06 | 81.06 |
36 | 45.12 | 81.12 |
37 | 44.18 | 81.18 |
38 | 43.24 | 81.24 |
39 | 42.31 | 81.31 |
40 | 41.38 | 81.38 |
41 | 40.45 | 81.45 |
42 | 39.52 | 81.52 |
43 | 38.60 | 81.60 |
44 | 37.68 | 81.68 |
45 | 36.76 | 81.76 |
46 | 35.85 | 81.85 |
47 | 34.94 | 81.94 |
48 | 34.04 | 82.04 |
49 | 33.14 | 82.14 |
50 | 32.24 | 82.24 |
51 | 31.35 | 82.35 |
52 | 30.47 | 82.47 |
53 | 29.59 | 82.59 |
54 | 28.72 | 82.72 |
55 | 27.86 | 82.86 |
56 | 27.01 | 83.01 |
57 | 26.16 | 83.16 |
58 | 25.32 | 83.32 |
59 | 24.49 | 83.49 |
60 | 23.67 | 83.67 |
61 | 22.85 | 83.85 |
62 | 22.04 | 84.04 |
63 | 21.24 | 84.24 |
64 | 20.45 | 84.45 |
65 | 19.66 | 84.66 |
66 | 18.88 | 84.88 |
67 | 18.10 | 85.10 |
68 | 17.34 | 85.34 |
69 | 16.58 | 85.58 |
70 | 15.82 | 85.82 |
71 | 15.08 | 86.08 |
72 | 14.36 | 86.36 |
73 | 13.64 | 86.64 |
74 | 12.94 | 86.94 |
75 | 12.26 | 87.26 |
76 | 11.60 | 87.60 |
77 | 10.95 | 87.95 |
78 | 10.31 | 88.31 |
79 | 9.70 | 88.70 |
80 | 9.10 | 89.10 |
81 | 8.53 | 89.53 |
82 | 7.98 | 89.98 |
83 | 7.44 | 90.44 |
84 | 6.93 | 90.93 |
85 | 6.44 | 91.44 |
86 | 5.99 | 91.99 |
87 | 5.55 | 92.55 |
88 | 5.15 | 93.15 |
89 | 4.76 | 93.76 |
90 | 4.41 | 94.41 |
91 | 4.08 | 95.08 |
92 | 3.78 | 95.78 |
93 | 3.51 | 96.51 |
94 | 3.27 | 97.27 |
95 | 3.05 | 98.05 |
96 | 2.85 | 98.85 |
97 | 2.68 | 99.68 |
98 | 2.52 | 100.52 |
99 | 2.37 | 101.37 |
100 | 2.23 | 102.23 |
101 | 2.09 | 103.09 |
102 | 1.96 | 103.96 |
103 | 1.84 | 104.84 |
104 | 1.72 | 105.72 |
105 | 1.61 | 106.61 |
106 | 1.51 | 107.51 |
107 | 1.41 | 108.41 |
108 | 1.32 | 109.32 |
109 | 1.24 | 110.24 |
110 | 1.16 | 111.16 |
111 | 1.09 | 112.09 |
112 | 1.02 | 113.02 |
113 | 0.96 | 113.96 |
114 | 0.90 | 114.90 |
115 | 0.85 | 115.85 |
116 | 0.80 | 116.80 |
117 | 0.75 | 117.75 |
118 | 0.70 | 118.70 |
119 | 0.66 | 119.66 |
120 | 0.62 | 120.62 |
Interestingly, women outlive men in nearly every country in the world, due to a mix of sociological, behavioral, and biological reasons.
COVID-19: Reversing A Decade of Increasing American Life Expectancy
While the current American life expectancy at birth seems reasonably high, it is nearly two years lower than the 2022 figure which used the 2019 mortality rate. It is also lower than the life expectancy at birth in 2009, which used 2005 mortality rate.
Year | Life Expectancy at Birth (Men) | Life Expectancy at Birth (Women) |
---|---|---|
2009 | 74.12 | 79.95 |
2014 | 76.10 | 80.94 |
2019 | 76.04 | 80.99 |
2023 | 74.12 | 79.78 |
American mortality rates went up 17% between 2019–2020, in part because of COVID-19, in turn affecting life expectancy. The U.S. also had a higher COVID-19 mortality rate compared to its peers two years after the pandemic first struck.
Thus, American life expectancy may not improve immediately to 2019 levels, which can affect insurance premiums, pension benefits, and plans.
Where Does This Data Come From?
Source: Office of Social Security, U.S. Government.
Note: The life expectancy at a given age is the average remaining number of years expected prior to death for a person at that exact age, born on January 1, using the mortality rates for 2020 over the course of their remaining life.
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