There is a new edition of Fantasy Age released a few months ago. It includes some of the mods and options from the various AGE system games, including Modern Age, Expanse, and the upcoming Cthulhu one. But yeah, Fantasy AGE is not classless. The designers felt that fantasy archetypes and class-based designed are easier for people coming into Fantasy AGE. There have been a number of classless hacks of the game. But as Thomas Shey says, it would probably be easier to start with Modern AGE or Threefold.I recently bought Green Ronins Modern Age and have been reading it, albeit slowly. We are taking the summer off and Im going to start a Modern Age game come this fall. The 2 other DMs in our group are going to run ShadowDark too concurrent with my game. I really like that Modern AGE is a "classless" system and Im assuming that Fantasy AGE is probably the same but I'd like to ask people who have played it if that is the case. Id also like to know peoples overall impression of Fantasy AGE and their experiences playing it, i.e. the system is too complicated, not complicated enough, character creation takes a long time but there are lots of options to make truly unique characters, things you'd change, things that need to be added or modified. I do like that there is only 5 or 6 official products so the system seems pretty finite.
Edit: FYI, I like the game as I find that it's easier to teach, play, and run for tabletop newbies, like my partner, who enjoyed playing Fantasy AGE. They disliked playing a mage in D&D but loved it in AGE. Obviously YMMV.
From what I can tell, Green Ronin's Threefold is a loose fantasy hack of Modern AGE. That might be a better starting point.You might be able to kitbash it with Modern Age, which I believe is technically classless.