age group 
noun
A number of people or things classed together as being of similar age: that attitude is widespread in my age group...
- That age group is the biggest category in the applications received by the Bureau.
- Nowadays it seems that everyone is at different stages of learning in the same age group.
- Perhaps my age group will be middle-aged for longer than any previous generation.
- cooling board
- cooling card
- cooling center
- cooling coil
- cooling curve
- cooling fin
- cooling-off period
- cooling pond
- cooling rack
- cooling tower
- coolish
- cool it!
- coolly
- CoolMax
- coolness
- cool one
- cool one's heels
- cool (or kick) one's heels
- coolroom
- cool store
- cool tankard
- coolth
- cool-touch
- cool-trough
- coolwort