Indiana 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 6.75M Indiana population, the 15-19yrs age group constituted the highest percentage of the total population (6.98%), followed by the 20-24yrs age group (6.89%), and the 10-14yrs age group (6.85%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (60.75%), followed by Children (0-17yrs) (23.58%), and Seniors (65yrs and Over) (15.66%).

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: Indiana ACS-5Yrs Estimates, 2021 Topic List.

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

Indiana Percentages of Population By Age Group in 2021

15-19yrs

20-24yrs

10-14yrs

55-59yrs

25-29yrs

5-9yrs

35-39yrs

60-64yrs

30-34yrs

50-54yrs

Indiana Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

Indiana Population By Age Group in 2021

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Age Group	Number of People	% of Total
15-19yrs	471419	6.98
20-24yrs	464895	6.89
10-14yrs	462360	6.85
55-59yrs	450414	6.67
25-29yrs	449725	6.66
5-9yrs	435910	6.46
35-39yrs	435296	6.45
60-64yrs	431922	6.40
30-34yrs	429207	6.36
50-54yrs	423365	6.27
45-49yrs	415581	6.16
Under 5yrs	415542	6.16
40-44yrs	408157	6.05
65-69yrs	360303	5.34
70-74yrs	276258	4.09
75-79yrs	178229	2.64
85yrs and Over	127413	1.89
80-84yrs	115344	1.71

Indiana Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	4101706	60.75
Children (0-17yrs)	1592087	23.58
Seniors (65yrs and Over)	1057547	15.66