There's the possibility a lot has happened off-screen between seasons and between Companions. Who knows how many adventures Ten had between "Runaway Bride" and "Smith & Jones". He might have lived another hundred years in there - of course, Rusty ruined that by having the Doctor talk about his age ALL THE TIME in the series. But potentially he's lying about that - once you get past 900, you stop counting :P
But I believe the original series said the First Doctor lived til 450 years - and now he's 900 years old. So those other 9 lives weren't as long lived as the first, but potentially 50 years each! :D
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There's the possibility a lot has happened off-screen between seasons and between Companions. Who knows how many adventures Ten had between "Runaway Bride" and "Smith & Jones". He might have lived another hundred years in there - of course, Rusty ruined that by having the Doctor talk about his age ALL THE TIME in the series. But potentially he's lying about that - once you get past 900, you stop counting :P
But I believe the original series said the First Doctor lived til 450 years - and now he's 900 years old. So those other 9 lives weren't as long lived as the first, but potentially 50 years each! :D