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In the codex it says he has been doing his thing for centuries, and yet he appears to be an unmodified semi-elderly human.

How?

Rejuvenat. Warp-travel time.

Rejuve is the most likely. It only works so far, for so long. So if he was already fairly elderly when he began rejuve treatment, it would not take him from, say, 75 to 40, and has time has gone on, he's simply staying in place, at best, at worst his apparent age is slowly creeping forward.

He keeps the AC on his mobile palanquin cranked up high. It's a well-guarded secret of the =][= that the cold keeps the skin tight and preserves one's youthful complexion.