You mean those of us who count our age in dog years can't be in love with Shan Yu? (Hey, Kat, where are you?)
Hey, it's mentally healthy to keep a strong love for fantasy and art and things considered childlike (which is very different from childish. And if you don't know what I mean, visit Shan Yu's Page of Shameless Lust (created by Kat).
If you visit the Guest Book (Hey, be sure to sign!), you'll find an entry by my husband who admits an undying crush on Jessica Rabbit! And he's not the only "adult" who loves an animated person. I think sometimes that a particular character just strikes a chord. And some of them just have what animal behaviorists like to call "super releasers": exaggerated characteristics that are supposed to elicit a particular response from members of their own species! (Check out the melons on Jessica, and that waist to hip ratio! Why do you think Barbie looks the way she does?)
Nope. Crushes on animated characters are not just for teenagers. And you know what? When you're in your 30's, you will probably still be developing crushes on animated characters. It's all part of the fun of never growing up. Woohoo!!