I would hate to think that in a few years i'm being flown around the world in a 747 by a couple of 20 year olds
If I recall correctly Mexicana had a severe home grown shortage (early 80's?) and was forced by circumstances, politics and other to eventually end up with 21 year old Captains, 19 year old First/Second Officers on the 727, the entire average age of the flight crew around 20!