The only movies that come to mind are vastly different in subject matter. One of my favorite movies of all time has to be Daddy Long Legs with Fred Astaire and Leslie Caron. From it one learns that love knows no age. Lolita (don't give me those looks) so maybe there is a dirty old man in some of us. Blue Lagoon is a good movie portraying the innocence of love.

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Deep into that darkness peering,
long I stood there, wondering, fearing,
Doubting, dreaming dreams
no mortal ever dreamed before.