Every Israeli gets drafted into the military at the age of 18, future pilots are no exception. The flight training in the IDF/AF used to take 2 years, so a typical graduate would have been 20 years old, although of course there are plenty of exceptions. Pilots would then serve for 5 or 6 years (depending on the platform they were assigned to). Usually there would be a period of 6-24 months after graduating flight school during which the pilot would receive additional training that would make him ready to take part in combat. So pilots as young as 21-22 were taking part in combat sorties.
The difference from other air forces is that Israeli pilots, even though are officers, do not have to have any post secondary education, which is why they accomplish their training at a younger age.
Recently there was an academic component added to the flight school, so the training now lasts 3 years. The graduates then serve for 9 additonal years (until the age of 30 for a typical pilot).
BTW, even after they are discharged from active duty service, pilots still continue to serve as reservists for many years, typically flying once a week. They are called up in case of war to complete the combat staffing of their flight unit. I estimate that more than half of the flight crew in a typical IDF/AF squadron are reservists.
P.S. Welcome to the board!
[Edited 2006-07-21 01:51:48]
[Edited 2006-07-21 01:52:10]
Pacifism only works if EVERYBODY practices it