Not_a_boffin
No different to this (1969)
or this (mid-80s)
then.
Quite a bit I'd say...
Tornado entered squadron service in 1982.....so I make that 13 years from 1969, so I seriously doubt there were any under 13's on those first Tornado squadrons!
Typhoon is longer at 1983 to 2003, but, again, I doubt there were any under 20 year old on those first Typhon squadrons?
Not saying there WILL be any on the first F-35 squadrons, but, given that 13 year time frame, became a 20 year time frame, and we're now looking at a nearly 30 year time frame period, and there could well be some under 30's on those first squadrons.....which is a staggering thought to me.