Well, I don't think they specified it being 17 years later in the movie - so that is wht they probably didn't mind aging the actors...
As for Frodo looking very young in the movie... Isn't it said that Hobbits don't reach maturity until about the age of 3O? If that is so then they would still look young at that age, because humans reach "maturity" at the age of 18. So would 30 year old hobbits look like 18 year old humans? It is just a theory. Please, feel free to prove me wrong.
And if that is true, then... Frodo received the ring when he turned 33, the ring slowed his aging... so, at the age of 50 he still looks 33 (which would equal 20 in human maturity using my theory).
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