I've 30 and have been into ENF for as long as I can remember, I guess because of certan events in my childhood. Always thought I was weird because I found certan things hot, but the most important part of it was because of the situation rather than a girl being naked.
I didnt even know it was called enf till I found more people that were into it, writing stories on message boards (like
http://disc.yourwebapps.com/Indices/58894.html), Seems the fetish is still pretty uncommon compared to the more popular ones, but I like trying to spread the word and make more people relize they are into it. I have been posting ENF threads on /h/ with my crapy colorings of ENF doujin before /e/ was even around trying to make it catch on, lol. I'm happy to see more people sharing my love of enf :p