Comment by Cthulhu_
Make them into a drinking game. We watched The Princess Bride the other day (never watched it), I think it's aged pretty well but then I'm old. But if they get bored, make it a game to have a drink or get a point or whatever for every sexual innuendo, lol.
Some films didn't age well though.
And finally, accept it and move on, ultimately it's their loss.