Harry Potter: How Old is Too Old?

So, just a question... at what age is it inappropriate to love the Harry Potter Series? Is it age 30?
Or if you are in the act of reading "The Half-Blood Prince" when you turn 35, do you instantly become a creep? Are kids and teenagers the only ones allowed to love the Harry Potter books?
I'm just asking; it’s not that I love Harry Potter or anything. I mean, the books are fun to read, and I'm totally looking forward to the next movie and everything, and I think Severus Snape is the coolest character in any non-kids’ story I've read in the last 10 years (number of non-kids’ stories I've read besides Harry Potter in the last 10 years = possible to count on one hand), but I'm totally NOT a Potter Freak™ or anything.
Does it mean you're a Potter Freak if you have watched all the movies at least once in the last 3 months? What if you like watching the movies at night, listening to the books on your iPod during your commute, and reading the books in any spare minute you have? I would imagine that someone who did all those things, AND was also over age 30 could be considered a freak; glad I've never done that.