Well, normally classic movies are considered movies that are about thirty years old or older, usually in black and white but not always, and they are still considered great movies to today's standards. Movies that are beyond retro. Examples:
Wizard of Oz
Gone With the Wind
Citizen Kane
Ben Hur
Casablanca
Ten Commandments
Its a Wonderful Life
To Kill A Mockingbird
Dracula (Bela Legosi one)
Frankenstein (Boris Karloff one)
The Day the Earth Stood Still
Godfather
The Good, the Bad and the Ugly
and alot more