u/GentlyGliding

In the late 90s or early 2000s I watched a Spanish movie on Canal Hollywood about a child who is born with the body of an old man and who becomes younger as time goes on.

No, this is not The Curious Case of Benjamin Button - that one came out in 2008, this one I'm talking about is an earlier Spanish movie.

From what I remember, in this movie there's a doctor telling the mother that he is a normal child; the other kids in school make fun of him because he has the body of a man in his 70s or so; and I also remember a scene at the end when he has the body of a little boy and he's rowing a boat, possibly to his death?

I've tried to look this up but I always get Benjamin Button. Any clues? I'm not sure but it's possible this a short film - I was very young when I watched it so I don't remember how long it is.