persons of approximately the same age and often of the same sex, nationality, educational or social background, etc.
Why Are Singing Groups Called “Glee Clubs”?These infamously chipper singing groups are called glee because the melding of voices makes everyone happy, right? Actually, joy has little to do with it.
Origin of age group
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for age-group
The age-group 15 to 20 shows very curious variations in the relative mortality of males and females.Women in Modern Industry|B. L. Hutchins
Also disturbing are statistics showing that most of those apprehended for it are in the eighteen-to-thirty-year age-group.Area Handbook for Bulgaria|Eugene K. Keefe, Violeta D. Baluyut, William Giloane, Anne K. Long, James M. Moore, and Neda A. Walpole