Damian, Larry, and I were last year, not this year. (And only half of last year for Damian and I) This year grants are generally smaller, and I think TPF is about ready to announce them. (I'll go nudge, just to make sure)
I'm pretty sure there's no age limit as such for the grants, but awarding of grants is based to some extent on the reputation and need of the grantee--while I don't think being underage would forbid granting, it would make it tough to build enough of a reputation (or demonstrate enough need) to warrant awarding the grant. There are a lot of worthy grant requests, and a very limited pool of cash, so things get looked at pretty closely.