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well acording to "voyage of the dammned" he says that he is 903 years old during his speach

Hmm... I dunno, I think the Second Doctor sounded pretty honest when he was counting up his age and came to 450 years old, in Earth terms. I'm betting that all of the First Doctor's adventuring meant he wore through his body a lot faster than the average Time Lord.

On the other hand, I agree about the ego. Especially with the newer Doctors, 900 just seems far too young. And he does always like to be mysterious.

I would think 450 years would nearly fill a 500 year diary... especially if you had a lot to write about! xd

I agree that he's in the region of 1000 to 2000... though at the same time I kind of wish he was younger because I hate the idea that we've missed seeing huge swathes of his life.

Seven had also worn out his body enough to look old (well older than when he started at least, not as old as One obviously...) so there's probably another 300 years just in his time, if we use the same theory of bodies wearing out.

Seven wasn't old looking for a human (I'm not going to be that rude to Sylvester McCoy! sad ) but in terms of how much the other Doctors change over their 'lifespans' (and assuming that they do all live a century or more in that time) then compared to them he aged quite a lot... which suggests his incarnation kept going for a lot longer OR experienced something that aged him prematurely, like what happened to Ten with the Master and all that.

Obviously in real life terms this ageing was because the other actors just did 3 or 4 years each in the role where as Sylvester kept the role for a lot, lot longer but it all goes towards the fictional age count just the same.

Yes, but I really think he's just unwilling to admit that he's not young anymore. People with his inflated pride tend to do that. Most Time Lords seem to have that sort of ego as part of their being, sort of like a parallel to human nature.