10 Oldest Characters In The Doctor Who Universe
7. Professor Chronotis
Estimated Age: Over 12,000 years.
A character in Douglas Adams' unmade TV story, Shada, Chronotis is a Time Lord who works at a college in Cambridge. Here, he receives a visit from the Fourth Doctor and Romana, where he tells them that he's been living there for 300 years.
But that's a low number when compared to Chronotis' actual age. In the 2012 novelisation of Shada, Romana observes that Chronotis must be around "twelve or thirteen thousand years old", meaning that he was born long before her time.
Granted, this is just an estimate on Romana's part, but considering that Time Lords are incredibly perceptive beings, it wouldn't be surprising if she was bang on the money (or close to it).
Chronotis is still alive after the events of Shada too, so he's probably a lot older than Romana's estimate - although it's difficult to pin a more exact number on it.