11 hours ago, Ambaryerno said:Except 20 years isn't all THAT big of a deal.
The last F-15C was built in 1985, and the type is still the backbone air-superiority fighter for the USAF, since there aren't enough F-22 Raptors to replace them. The B-52 is still one of the US's primary long-range strategic bombers, and the last one rolled off the assembly line in 1962 , with the type anticipated to still be in service into the 2060s!
Depends which period of aviation history you compare to, you wouldn't want to be rocking in a Fokker Dr.I in 1940 or Bf-109 in 1960.
Clone Wars saw three generations of fighters (V-19 -> Z-95 -> V-wing) in just three years.