''I read a while back that the USAF already has B52 pilots who are the grandchildren of original B52 pilots... the airframes are currently slated to still be operational around 80 years after manufacture.''
The RAF VC10 fleet had a Captain who was the third generation of HER family to fly the aircraft. Her Grandfather did the developement flying in BOAC, her dad flew them before joining the Concorde fleet, and she later flew them in the RAF.
The B52s have sat around on alert for a lot of their life and despite being old, have very few hours - especially compared to civil aircraft. Quite a few of the KC135s are in the same caegory.