[afterburner]

Tupolev TU-95, Wikipedia: "First flown in 1952, the Tu-95 entered service with the Soviet Union in 1956 and is expected to serve the Russian Aerospace Forces until at least 2040"

Yeesh, I guess they must have done something right with that plane.

[MagnumOpus]

Same for US bombers - the B52 also first flew in 1952 and is expected to serve into the 2050s. Bomb trucks don't need ultramodern stealth, supercruise, vectored thrust etc - they need air superiority provided by other aircraft, a big jet engine, and reliability.