How Old Was Peter Capaldi When He Played Dr. Who? Why Did Peter Capaldi Quit Doctor Who?

Peter Capaldi was 55 years old when originally cast on Doctor Who. Capaldi was only a few months younger than William Hartnell (the First Doctor) was, when he was cast in the role, and is the oldest actor since Hartnell to star as the Doctor and the third oldest to portray the character.

Why Did Peter Capaldi Quit Doctor Who?

While it could be “a nice way to live,” Capaldi told a New York Comic Con audience in October 2017 that because the work expectations were so rigorous, it eventually became too hard to maintain the level of commitment to Doctor Who that he truly wanted (via Deadline).