I've seen a few topics like this, but as of now I can't remember how to find those topics.
I just really want to read a yaoi where the seme is younger. and I'm talking about 5 to even 20 years younger. As long as the uke isn't really manly and big and so. I don't mind if the seme is a child or if he looks older for his age, as long as he is younger in age :> thank youuu

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http://www.smackjeeves.com/comicprofile.php?id=135230
yaoi webcomic ._.

I'd recommend reading Naono Bohra's works, she often uses younger semes.

Some I like:
Ai no Kotoba wo Uragaeshi
Dare ga Omae wo Suki dato Itta
Boku no Shiru Anata no Hanashi
Gokujou no Koibito
Koi Shika Dekinaiyo
Second NAONO Bohra


Here you go - Older Uke Younger Seme