7. The 500-Year Diary
This is an interesting one because it 's the first time fans were given a real hint at just how ancient the Doctor might be. He was obviously old as the First Doctor but always a little vague about it. He retrieves the diary from his storage chest on the TARDIS and carries it around in his coat thereafter. It resurfaces in Tomb of the Cybermen and the Doctor comments that his age might be around 450 earth years. Subsequent speculation can be had as to whether or not his diary is working in Earth years or Gallifreyan years. It depends on where he bought it, really. Though how many shops on Earth are selling 500-year diaries? In the 1996 TV Movie fans saw that the Seventh Doctor had moved on to a 900-year diary - a swish, leather-bound copy, too. Moleskin, no doubt. Even the Doctor has standards.