Interesting... I just found out that the actor slated to play the Eleventh Doctor, Matt Smith, is, at 26, the youngest actor ever to be cast as the Doctor (three years younger than No. 5, Peter Davison, when he took the job in 1980). Even more interesting is that one of the candidates for the role of No. 11 was Sean Pertwee, son of the actor who played the Third Doctor, Jon Pertwee.