Yay! Yeah, with Albus more easily accessible through the community, he'll be pestering him afterwards. XD But before that they'll have their together months. <3

And to confirm as Crocker-mun said above, Gellert will stay as he is (22) until either just before or just after Albus comes back younger. So he can sort Denzel out/help him until then, and he will still remember him afterwards. He just won't exactly know why Denzel is confused about his age.... XD