I can't tell from the art if he's aged since the Stormwatch flashbacks; he's always looked early-thirties to me. This is a digression.

I think he has aged a little, and considering in the false future Bendix had shown to Midnighter in Revolutions Apollo had aged considerably, I think both Apollo and Midnighter beleive that they can age.

So he could, at least temporarily, throw down with a full-blooded, very powerful, old Kheran, which I don't think I've seen a hybrid do.

Yep, and Winter did "swallow" the destructive power of a full complement of nuclear misiles, which I kinda doubt a hybrid or a seedling could do either.