On one of the episodes where House ends up being admitted to hospital, his wristband says 11 June 1959, which is Hugh Laurie's age too. Which would make him 49. I think it was No Reason?
Heh, i just answered this on the Huddy Spot, lol.
Anyway, in Season 3's "Top Secret" Wilson says that House is 45 so he'd be around 47 now.
However, the timeline on this show is really messed up so i wouldn't be surprised if TPTB change his age. :)
