I'm from the planet Gallifrey in the constellation of Kasterborous. I'm 903 years old, and I'm the man who's gonna save your lives and all six billion people on the planet below.
Before the Eleventh Doctor's 200-year farewell tour between TV: The God Complex and Closing Time, the writers of the 2005 revival of the series explicitly described the Doctor as around 900 years old, despite contrary statements on TV and expanded media.
Based purely on what is confirmed on-screen, the Face of Boe is at least 4,999,800,053 years old. However, since in "Bad Wolf" (which takes place in the year 200,100) he was said to be the "oldest inhabitant of the Isop galaxy", he's likely much older than this.
The Doctor's name is...
Theta Sigma – or ΘΣ, if you're feeling flash – was the nickname given to the Doctor at the Time Lord Academy on Gallifrey, according to Drax, a student contemporary from “the class of '92” who the Fourth Doctor bumped into again during The Armageddon Factor.
The Doctor is no longer from Gallifrey
(Gallifrey wasn't actually named as such for another four years, but the basic point still stands.) The Timeless Children establishes that in fact the Doctor originated somewhere else entirely – though where exactly is unknown.
In The Deadly Assassin (1976), it is established that a Time Lord can only regenerate twelve times, for a total of thirteen incarnations. This statement is later repeated in Mawdryn Undead (1983), the 1996 TV film and "The Time of the Doctor" (2013).
The Fourteenth Doctor is the current incarnation of the Doctor, the protagonist of the BBC science fiction television series Doctor Who. He is portrayed by Scottish actor David Tennant, who previously portrayed the Tenth Doctor and was last seen in the programme in that role in 2013.
On Saturday, the beloved British sci-fi series Doctor Who unveiled the very first photos of Ncuti Gatwa as its Fifteenth Doctor and his costar Millie Gibson as his companion Ruby Sunday.
Clara is the future child of the Doctor and River who's had her memory erased. The two Time Lords must be up to something on their nights away from River's prison cell.
River Song knows The Doctor's real name
until she whispers his true name in his ear. This proves to him that he will one day grow to trust her in a way that he rarely trusts anyone, causing a huge shift in the way he treats her for the rest of the episode.
The Youngest Doctor in the World: Balamurali Ambati
Balamurali Ambati is a well-known ophthalmologist who made history by becoming the youngest doctor in the world at the age of 17. He was born on July 29, 1977, in Vellore, India.
Dr. Howard Tucker is a neurologist from Cleveland, Ohio and was named the ”Oldest Practicing Doctor″ by Guinness World Records.
100-year-old Howard Tucker, the 'world's oldest practicing doctor' reveals the secrets of enjoying a long, happy life.
Time Lords are extremely long-lived, routinely counting their ages in terms of centuries; the Second Doctor claimed in The War Games that Time Lords could live "practically forever, barring accidents." The series has suggested that Time Lords have a different concept of ageing from humans.
By the time the Mara began attacking the residents of Trenzalore, the Doctor had been there for 750 years, making him 1950. Right after regeneration, the Twelfth Doctor claims to be over 2000 years old, meaning the Eleventh Doctor spent over 800 years on Trenzalore.
He was 903 years old in Voyage of the Damned, he spent 200 years travelling between The God Complex and Closing Time, and then he spent presumably 900 years on Trenzalore and as such he is 2000 years old by the time of Twelve in Deep Breath.
In answering that question in Doctor Who Magazine, Moffat suggested that the TARDIS' dislike of the current companion may be due to her sceptical nature and how she did not seem suitably awed by the Doctor's spaceship.
The Eleventh Doctor and Clara Oswald (The Snowmen, 2012)
But it's Clara, in her Victorian governess mode, who delivers a proper Christmas kiss, attaching herself to the Doctor's face for so long he must be grateful Time Lords come with a respiratory bypass system.
In "A Good Man Goes to War", it is revealed that River is Amy and Rory's daughter Melody (Harrison and Maddison Mortimer), who was conceived in the TARDIS while it was in the Time Vortex and consequently carries Time Lord DNA.
Basil the Doctor (Armenian: Barsegh or Barsel) was an Armenian priest and poet. As the chaplain and confessor of Baldwin, Frankish lord of Marash, he wrote a funeral oration on the latter's death at the battle for Edessa in 1146.
Jenny is the daughter of the series protagonist the Doctor, a product of altered DNA extracted from a tissue sample of his tenth incarnation's hand. The character was created by writer Stephen Greenhorn.
One possible in-universe reason the Fourteenth Doctor is so similar to the Tenth is that the Master's forced regeneration somehow messed with the Doctor's regenerative ability.
End of an era on #Doctors as Daniel and Zara decide to call time on their jobs and pull out of being partners at The Mill. With Matthew Chambers leaving the show shortly it looks like more change is coming to Letherbridge in 2023.
Sex Education actor Ncuti Gatwa has been announced as the next incarnation of the Doctor. The 29-year-old is only a few years older than Matt Smith was when he became the youngest actor to ever portray the Time Lord in 2011 at age 26.