Quote Originally Posted by Rannie View Post
There were only two people from the Source that would have and DID age. One was G'raha Tia but his life was prolonged due to him Merging with the Crystal Tower and thus aging but not dying
Actually he stopped aging completely (confirmed in question 2 here) and isn't really mortal any more. His white-tinged hair seems to be part of the crystallisation effect rather than from age.

Anyway, even though he's back to his younger mortal body, his mind is a lot older - 120ish now, give or take how much time he spent in the dark future timeline and exactly how many years ago he arrived in the First.