Missouri Population By Age Group and Age Cohort in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 6.14M Missouri population, the 55-59yrs age group constituted the highest percentage of the total population (6.85%), followed by the 60-64yrs age group (6.71%), and the 25-29yrs age group (6.70%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (60.50%), followed by Children (0-17yrs) (22.67%), and Seniors (65yrs and Over) (16.83%).

The first and second charts below shows the percentage of the population by age group and age cohort respectively. The table below also shows the number and percentages for each age group and age cohort.

You can see similar information for other states, and the United States.

Related Topics: Missouri ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates.

Missouri Percentages of Population By Age Group in 2021

55-59yrs

60-64yrs

25-29yrs

10-14yrs

30-34yrs

15-19yrs

20-24yrs

35-39yrs

50-54yrs

5-9yrs

Missouri Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

Missouri Population By Age Group in 2021

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Age Group	Number of People	% of Total
55-59yrs	420482	6.85
60-64yrs	411935	6.71
25-29yrs	411737	6.70
10-14yrs	404107	6.58
30-34yrs	402614	6.56
15-19yrs	401712	6.54
20-24yrs	400642	6.52
35-39yrs	397400	6.47
50-54yrs	380808	6.20
5-9yrs	380122	6.19
Under 5yrs	367132	5.98
40-44yrs	365684	5.95
45-49yrs	363323	5.92
65-69yrs	340428	5.54
70-74yrs	271181	4.42
75-79yrs	180289	2.94
85yrs and Over	122558	2.00
80-84yrs	119380	1.94

Missouri Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	3715323	60.50
Children (0-17yrs)	1392375	22.67
Seniors (65yrs and Over)	1033836	16.83