I am also 30. I've always been a Star Trek fan. I grew up mostly on TNG. And I admit, while I was a fan of the characters and the era, I never really liked the sereies (TOS). But over the last few years I've slowly grown to like it. I didn't force myself to like it or anything, I just grew to appreciate it.
I think it depends on the younger person. Like with anything, some will like it, other won't. But you can see more youth not having an interest in things such as TOS, just a sign of changing times.