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