User blog comment:D. Cello/Assassin's Creed: Revelations (PC) - Official Assassin's Creed Wiki Review/@comment-3018037-20111218042124/@comment-4144674-20111218042554

...He was in his early 90s, not to mention the fact that he was an active Assassin and Mentor for decades, so that fact that he doesn't have the stamina of his 26 year-old counterpart from Assassin's Creed makes sense.