What are some pre-1980 movies that age well? My vote is for Star Wars and Butch Cassidy and the Sundance Kid.

The Wizard of Oz!

Citizen Kane
Casablanca
Godfather 1 & 2
Jaws
2001
Lawrence of Arabia
The Exorcist
Apocalypse Now
Close Encounters...

For the most part, I'm just repeating others, but...

To Kill a Mockingbird
Citizen Kane
Jaws
The Godfather 1 & 2
Butch Cassidy and the Sundance Kid
The French Connection
Patton
The Muppet Movie
Pinocchio
All The President's Men
Apocalypse Now

Robert Davi-Sanchez in Licence to Kill said Cubby Broccoli made Bond films to last. Connery's Dr No and From Russa with Love, less technology in those help.

Halloween

airplane and the naked gun movies.

The Sting ages much better than Butch Cassidy for me. Best con man movie ever!

The Sound of Music

Sunset Blvd. by Billy Wilder

Most of Stanley Kubrick's films - his films have a timeless quality to them. Esp. Barry Lyndon, Clockwork Orange, 2001, and The Shining.

It's a Wonderful Life by Frank Capra

Belle du Jour by Luis Bunuel

Citizen Kane by Orson Wells

Raging Bull (I'm gonna squeeze this in) by Martin Scorsese

Beauty and the Beast by Jean Cocteau

Black Narcissus by Powell/Pressburger

The Godfather 1 and 2 by Francis Ford Coppola

Blow Out by Brian De Palma

Grease by Randal Kleiser

A Streetcar Named Desire by Elia Kazan

The Bad and the Beautiful by Vincente Minelli

Night of the Hunter by Charles Laughton

Singin' in the Rain by Kelly/Donen

The Wild Bunch by Sam Peckinpah

Yojimbo, Sanjuro, Rashomon, Hidden Fortress, and Seven Samurai by Akira Kurosawa

Bonnie and Clyde by Arthur Penn

Gone With the Wind and Wizard of Oz by Victor Fleming

Casablanca by Michael Curtiz

Psycho and Vertigo by Alfred Hitchcock

Nights of Cabiria by Frederico Fellini

Wizard of Oz, Wonderful life, Star Wars and Grease (few of my picks)

Superman: The Movie

Predator

Darn, that was gonna be my vote.

Most of these others too, but that's the first one that leapt to my mind.

Fritz Lang's M
more than 70 years old and still thrilling.

Mostly if we can name it it has aged well. The whole reason a film that is 30 or more years old remains part of public awareness is because it has transcended its era and has therefore "aged well". We don't even know the names of films that havn't aged well

The Evil Dead trilogy
Goodfellas
West Side Story
Taxi Driver

Really enjoyed Casablanca.

The Good, The Bad and the Ugly

Great films, by great directors, with great performances...

Werner Herzog's films come to mind.

Some select titles older than 30 years:

Blue Angel, The (1930)

Trouble in Paradise (1932)

Scarlet Empress, The (1934)

Grand Illusion (1937)

Midnight (1939)

Life and Death of Colonel Blimp, The (1943)

Children of Paradise (1945)

Sullivan's Travels (1942)

Beauty and the Beast (1946)

Black Narcissus (1947)

Kind Hearts and Coronets (1949)

Twelve O'Clock High (1949)

All About Eve (1950)

Rashomon (1950)

Lavender Hill Mob, The (1951)

Kansas City Confidential (1952)

Captain's Paradise, The (1953)

Wages of Fear (1953)

Seven Samurai (1954)

Bob le Flambeur (1955)

Diabolique (1955)

Ladykillers, The (1955)

Bell Book and Candle (1958)

Hidden Fortress (1958)

Horse's Mouth, The (1958)

Touch of Evil (1958)

Good Morning (1959)

Some Like It Hot (1959)

Avventura, L' (1960)

Black Sunday (1960)

Peeping Tom (1960)

Yojimbo (1961)

Counterfeit Traitor, The (1962)

Sanjuro (1962)

8 1/2 (1963)

Mind Benders, The (1963)

Servant, The (1963)

Diary of a Chambermaid (1964)

Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)

Woman in the Dunes (1964)

Collector, The (1965)

Pierrot le Fou (1965)

Red Beard (1965)

Repulsion (1965)

Saragossa Manuscript, The (1965)

Closely Watched Trains (1966)

Accident (1967)

Belle de Jour (1967)

Don't Look Back (1967)

Fireman's Ball (1967)

Andrei Rublev (1969)

Blind Beast (1969)

Joke (1969)

Rider on the Rain (1969)

Dodesukaden (1970)

Clockwork Orange, A (1971)

Devils, The (1971)

Even Dwarfs Started Small (1971)

McCabe & Mrs. Miller (1971)

Un Flic (1971)

Aguirre: The Wrath of God (1972)

Cries & Whispers (1972)

Discreet Charm of the Bourgeoisie (1972)

Images (1972)

Solaris (1972)

Don't Look Now (1973)

Turkish Delight (1973)