They just can't get enough of each other. They just can’t get enough of each other.

“Before Midnight,” out Friday, checks in on the lovers who met in 1995’s “Before Sunrise” and re-met in 2004’s “Before Sunset.” They’re not the first movie couple to stick it out for the long haul.

Carl and Ellie
Condensed to a wordless, four-minute montage, the till-death-do-us-part love story of this couple in 2009’s “Up” makes for the most tear-inducing opening scene of all time.

Eben and Jennie
In 1948’s “Portrait of Jennie,” Joseph Cotten is a struggling artist and Jennifer Jones is a little girl who bends time so they can be together age-appropriately. Makes your last Valentine’s Day present look a little cheap, huh?

Doris and George
In 1978’s “Same Time, Next Year,” the main characters (who meet once a year in the same hotel room) are married to other people. Adultery — bringing people together since the dawn of time.

Daniel and Helen
In 1992’s “Forever Young,” Mel Gibson is a pilot who asks to be frozen in 1939 because he can’t bear to live without his comatose girlfriend. He wakes up in 1992 and, hey! — she’s alive and well. That was 53 years well spent.

Ethel and Norman
The longtime couple’s summer cottage is the setting for 1981’s “On Golden Pond,” which reveals the universal truth of enduring relationships: Eventually your significant other will drive you absolutely bleeping insane.