Page "TARDIS" Paragraph 30

The TARDIS was already old when the Doctor first took it, but its actual age is not specified.

The spin-off media have, on a number of occasions, had the TARDIS wait around for the Doctor for decades and even centuries in relative time.

In " The Empty Child " ( 2005 ), the Ninth Doctor claimed that he has had " 900 years of phone box travel ", while " The Doctor's Wife " says they've been travelling together for only 700 years.

In the unfinished TV serial " Shada ", fellow Time Lord Professor Chronotis said that the Type 40 models came out when he was a boy.