Lucky Fire, not if his name is Deus - Deus is basically ageless. In Cycle, his age is hinted at, and the realization should be pretty fun.
Well, so far I have the idea that the main protagonist gets forced into something against his/her will, and can't back out of it. Then someone else helps him/her to live this new life, coaching along the way.
I have the beginning figured out, but as with all fanfics, the trickiest part to figure out is the middle.
It's very nice that you wish to help, though! If things go well, I may ask you for some input.