What's an alternative term for "age groups"? [closed]

I want to employ the formation "age groups" in a sentence worded in a different way. Is "age fragments" right to employ? If not, what else could be used?

A perfect synonym is "age bracket".

(macmillan) age bracket the range between two particular ages
people in the 50–60 age bracket

(OALD) age group noun, Eng /ˈeɪdʒ ɡruːp/ Am /ˈeɪdʒ ɡruːp/
(also less frequent age bracket) people of a similar age or within a particular range of ages

cohort (n.)

A group of individuals having a statistical factor (such as age or class membership) in common in a demographic study

a cohort of premedical students
the cohort of people born in the 1980s m-w

A group of people with a common statistical characteristic. Lexico

The low growth rate for the under-20 cohort reflects the drop in the fertility rate from a peak of 3.61 in 1960 to a low of 1.76 in 1978, a fall-off that gave rise to the baby-buster cohort. P. E. Peterson; The Social Security Primer

The youngest two cohorts were aged 9–10 years (cohort one) and 11–12 years (cohort two) and were still in primary school... The next two cohorts were aged 13–14 years (cohort three) and 15–16 years (cohort four)... L. B. Hendry et al.; Young People's Leisure and Lifestyles