Emo hair power!
I always assumed it was supposed to be applications of Wish spells.Sure, the nerfed polymorph isn't great, the stone stuff is pretty good IMO, but the other two things are pretty meh[their 2nd level ability is of very limited usage, compare to the diviners Foretelling divice?]. But once you get to 14thlevel you can be as young as you want. While you can still die from old age. Wizards seem to have some never mentioned defense against that anyways(since every edition has had wizards who live way longer than they should, and every edition has NEVER explained that).