As a kinda guideline rule to myself, I say 7 years and up is an age gap...
There is both shoujo and yaoi on this list, and they are in no particular order ^^ It also only consists of manga that I like or at least enjoyed reading. I also added a list of tags other than Age Gap that I have on the stories, to give you an idea of what might be in it.
(I'm always open for any suggestions you might have ;D )
