Originally Posted by
LeoNYC10
Some a320s are also quite old, I know, but most a320s flying today are actually different from the initial versions of a320s and were produced in the 2000s.
Delta's active A320s all came from Northwest and were introduced to service between 1990 and 1999. Both Delta and Northwest had 757-200s. The active fleet was introduced to service between 1990 and 2005.
https://www.planespotters.net/airline/Delta-Air-Lines
Aircraft manufacturers had figured out temperature control in the 1960s. Turbulence is largely a function of wing loading, not aircraft age. Passengers may note the age of interiors (seats, bins, AVOD, service units - the overhead lights and air vents). They will not note the age of engines.