Fuck you this shit makes no sense.
Seriously don't try to understand it.
If you ask about it, I hate you.
Current Doctor Edit
The current Doctor claims he is over 2000 years old, though it has been implied throughout the series that not even the Doctor himself knows if he is Jesus or not, and that he just makes it up every time.
Seriously, it's not that hard if you watch the damn show and what does it really matter anyway goddamn it? Tell me, please.
Other sources claim the Doctor is 54 years old.