how old is old

I have several favorites from the 70s which is almost 50 years old...but I know you mean older

The Way We Were
Rocky
Animal House
Chinatown
Godfather
One Flew Over the Cuckoos Nest
Longest Yard

others that are older

Bridge over River Kwai, North By Northwest, An Affair to Remember, Rear Window, Butch Cassidy and Sundance Kid, Cool Hand Luke, Goldfinger (actually any Bond film), Magnificent 7....basically any movie with Frank Sinatra, Cary Grant or Steve McQueen.....these are off the top of my head

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