Rhys Thomas and Tony Way were 17 when they started writing for the 11 O'Clock Show in 1998. Rhys has since written the sitcom 'Fun At The Funeral Parlour' and written and appeared in 'Fast Show' and 'Down The Line'. And loads of others.
Debbie Barham was 14 when she first began writing for the radio - and she probably wrote more gags per year than most of us manage in our lifetimes. She lied about her age and pretended to be 16 in case people thought she was too young to be in the writers' rooms!