I. ˈ ̷ ̷ˌ ̷ ̷ noun
1. : a group of persons of the same sex and approximately the same age having certain definite duties and privileges in common and constituting a division of a tribe or society
2. : a stage (as boyhood, adolescence, or manhood) through which an age-grade passes
II. transitive verb
Etymology: age-grade (I)
: to grade by age or organize by age-grades
an age-graded tribe