Demographics

The World Population in 2100, by Country

Published

3 years ago

September 2, 2020

Iman Ghosh

Global Population Estimates 2100

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The World Population in 2100, by Country

In 2015, the United Nations predicted that the global population could surpass 11 billion by the end of the century.

Last year, the UN revised these estimates, but the numbers it came up with were still well above 10 billion. These regular projections from the UN have been the status quo—until now.

Plenty of signs have pointed to there being a population plateau, but recent research from the Institute for Health Metrics and Evaluation (IHME), published in The Lancet, suggests that the number of people on this planet may actually start to shrink well before the year 2100.

Here’s a closer look at these complex projections.

UN vs. IHME Population Estimates

According to the UN, the world population is set to steadily rise over the years:

2030: 8.5 billion
2050: 9.7 billion
2100: 10.9 billion

In contrast, IHME paints a different picture. It projects the population to actually peak at 9.7 billion in 2064. Following this trajectory, there could be 8.8 billion people in 2100, approximately 2 billion fewer than previously thought.

Various demographic factors are behind these differences—higher life expectancies, migration rates, and lower fertility rates. For this last factor, independent drivers including contraceptive access and higher educational attainment were also considered.

A shifting age structure is also a key aspect of this transition. By 2100, over a quarter of the world or nearly 2.37 billion will be aged 65 years and above.

The Most Populous Countries in 2100

Amid all these demographic sea changes, which countries will come out on top?

Despite an overall decline in numbers to 1.09 billion people in 2100, India moves up from second to first place on the population leaderboard.

Rank	Country	Population (2017)	Rank	Country	Population (2100E)
#1	🇨🇳 China	1.4B	#1	🇮🇳 India	1.09B
#2	🇮🇳 India	1.38B	#2	🇳🇬 Nigeria	791M
#3	🇺🇸 U.S.	325M	#3	🇨🇳 China	732M
#4	🇮🇩 Indonesia	258M	#4	🇺🇸 U.S.	336M
#5	🇵🇰 Pakistan	214M	#5	🇵🇰 Pakistan	248M
#6	🇧🇷 Brazil	212M	#6	🇨🇩 DR Congo	246M
#7	🇳🇬 Nigeria	206M	#7	🇮🇩 Indonesia	229M
#8	🇧🇩 Bangladesh	157M	#8	🇪🇹 Ethiopia	223M
#9	🇷🇺 Russia	146M	#9	🇪🇬 Egypt	199M
#10	🇯🇵 Japan	128M	#10	🇹🇿 Tanzania	186M

The populations of both India and China will begin to contract after the mid-century—and it’s predicted that China’s total population will drop by almost half to 732 million by 2100.

Led by Nigeria, Sub-Saharan Africa is the only region that will continue to see growth by century’s end. In fact, four of the top 10 countries in the world in terms of population count will be located in Sub-Saharan Africa.

Tightly Packed Together

One final thing to consider is how population density may look in 2100, with many more people clustered in the same areas. For example, Nigeria is dealing with a land area nearly 11 times smaller than the U.S.—but it will have more than double the population.

Country	2100 Pop.	Area (Millions, km²/mi²)	Population Density per km² (mi²)
🇳🇬 Nigeria	791M	0.92M km² (0.36M mi²)	856.3 (2217.7)
🇮🇳 India	1.09B	3.29M km² (1.27M mi²)	331.6 (858.8)
🇵🇰 Pakistan	248M	0.88M km² (0.34M mi²)	281.2 (728.3)
🇪🇹 Ethiopia	223M	1.10M km² (0.42M mi²)	202.7 (531.0)
🇪🇬 Egypt	199M	1.01M km² (0.39M mi²)	197.0 (510.1)
🇹🇿 Tanzania	186M	0.95M km² (0.37M mi²)	196.3 (508.5)
🇮🇩 Indonesia	229M	1.90M km² (0.74M mi²)	120.2 (311.4)
🇨🇩 DR Congo	246M	2.35M km² (0.91M mi²)	104.9 (271.7)
🇨🇳 China	732M	9.60M km² (3.70M mi²)	76.3 (197.8)
🇺🇸 U.S.	336M	9.83M km² (3.80M mi²)	34.2 (88.5)

Regardless of how the future population count shakes out, it’s clear that these heavyweight countries will undergo significant transformation in the coming decades.

Related Topics:china india population nigeria aging population aging featured 2100 population world population nigeria population population projection

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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.

Published

19 hours ago

November 29, 2023

Pallavi Rao

Chart showing the average years left to live at every age for men and women.

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.