Ah, well, the founders of Time Lord society were a pompous lot - hence the name - and figured that once they'd harnessed the power of a black hole to fuel time travel, defeating death would be simple for them. 'Course, they also went completely mad in the end, so I suppose that's the moral of the story about playing god, eh?

Mmhm. If you make your regenerations last long enough, then you can live for, well, hundreds upon hundreds of years. I'm not terribly cautious, and I'm more than a thousand years old. [He's pretty sure that the Aspects are quite a bit older than that, if younger than his race as a whole.]