User blog comment:ASSASSINO/will we get to see altair as he ages in assassin's creed revelations?/@comment-4043223-20110821200233

Yes as the memories progress (via Ezio's use/finding of the artifacts left behind by Altair) we will get to see him during different periods of his life, up until he is old. How old.... well this hasn't been confirmed but speculation is 92 but everything else with regards to the age progression has been confirmed by Alexandre Amancio.