This is my lawn

I've wondered about that too. But then I shrug it off because it's a show about time travel and at that point you know we're going to be getting some pretty questionable logic.

...it's a show about time travel ...

 

Oh, no, I forgot this!  I'm going to get a ton of answers that are all wibbly-wobbly timey-wimey explaining!

 

I TAKE IT BACK!  I QUESTION NOTHING!

 

-hides in a bunker, bracing for super nit-picky responses-

You mean how does he live to be 2000 when he has such a tendency to die a lot?

 

Well the important thing to remember is that even the Doctor doesn't remember how old he is. As he says in Day of the Doctor, he can't tell if he's lying anymore. We barely  know how old the first Doctor was before he set off with his granddaughter. Then we have to call into question how canon we consider the audio dramas, because if so we can add several hundred onto 7's run. 8 had almost as long with another several hundred years. 11 survived for 900 years on Trenzalore, let's not forget. Really, the Doctor's age doesn't matter at this point. What matters is that he is incredibly old and yet still looks pretty darn good for his age. 

 

...it's a show about time travel ...

 

Oh, no, I forgot this!  I'm going to get a ton of answers that are all wibbly-wobbly timey-wimey explaining!

 

I TAKE IT BACK!  I QUESTION NOTHING!

 

-hides in a bunker, bracing for super nit-picky responses-

 

 

Ok. Now I'm very confused.

I propose that it's all the companions' fault.  He has a much better survival rate when he's on his own, but having those stupid humans around gets him into much more lethal danger.

 

Ok. Now I'm very confused.

 

That's the general reaction I get (in general).  Basically me just being a doof (about how time travel complicates everything).

Ok. I just wasn't sure if it was sarcasm or whatnot. 

I saw a great analysis of the Doctor's age and how it correlates to how he feels about regeneration - I wish I could find it again, but it deduced that the Tenth Doctor didn't live nearly as long as many of his previous incarnations and thus was more prone to being emotional over a regeneration that happened before it was perhaps "supposed" to happen.