There is no generational link between like or dislike of the movie.
He said Axiomatically.. ^_~
Most TOS fans I know disliked the movie. I say TOS fans as in largely exclusively TOS fans. So, for instance, they include:
Myself (Age 35, grew up on the old show, didn't like the newer ones)
My wife (Age 33, grew up on TNG but recently plowed through all of TOS and loves it and recognizes that TNG warn't that great a show despite some great episodes and talent)
My buddy (Age 28--devoured TOS when I introduced him to it, hasn't seen anything else, thought NuTrek was the stupidest thing he ever saw)
I bring up this cross section because I'm vaguely Gen X and the other two are absolutely not. For my buddy, there's no "40 year fog of forgiveness." He got into the show as a *new* show. And immediately thereafter, he watched the movie. And he thought it sucked. Not just mediocre. Sucked.
So, you're right--there is no direct age relation to whether you'll like the movie or not. But, as this forum has shown, I think the more into TOS you are, the less you'll like the movie.
Of course, I can forgive the movie for not being at all TOSsy. I think it was just a lame-ass movie.