If you'll remember, actors Lea Thompson, Michael J. Fox, Christopher Lloyd, Crispin Glover, and Thomas F. Wilson (Biff) all wore heavy aging makeup throught the trilogy. Wilson, Thompson, Glover, and Lloyd all aged 30 years from 1955 to '85—Glover, who played Fox's dad, was actually younger than Fox at the time of the filming—and Wilson actually ended up aging 60 in the Part II scenes filmed in 2015.
This is where things get trippy: We're now nearly 30 years removed from the first film. Meaning, it's the perfect opportunity to circle back and see how everyone aged.
Biff: Nailed. He looks nearly identical to his 1985 “old” version. But Thompson, Fox, and Glover, as a Redditor pointed out this morning, look way better than the makeup crews ever predicted. Healthy lives? Or something medically enhanced? We'll never know.
And, via the Telegraph, Michael J. Fox and Christopher Lloyd: