Originally Posted by FrustrationMan
They probably didn't have walkcycles for old Brink and figured no one would notice him young again. His old age has to do with the crystals, at least according to the novelisation, though it also says he'll still live along time. Strange.
That's what I thought, too, but Old Brink animation is in the resource files. You can see them here, a bit lower than halfway down the page.