The BBC has announced that actor Matt Smith, age 26 will be the next actor to take on the role of The Doctor, after David Tennant regenerates.

The final of the four special episodes of Doctor Who with Tennant as The Doctor will run in early 2010 – presumably the regeneration will be in that episode, putting Tennant’s run as The Doctor (2005-2010) at approximately 4 years, on par with John Pertwee’s run (1970-1974).