Re: How old is Thor?
Ages are irrelevant in most movies unless it plays into the plot heavily. In some ways, the first 'Thor' was a strange coming of age story but Thor's age didn't really matter. You just assumed he was young (for his race of people) and reckless and that was enough.
"For me, I hope people take away when they see 'The Force Awakens' is the sense that in the most ordinary life, the most extraordinary things can happen."
-- J.J. Abrams