The Doctor's age

Contradictory information has pointed at different estimates of the Doctor's age, both in absolute term and in terms of the length of various incarnations.

First Doctor
Magnus chided the Doctor for holding on to this incarnation as long as he did. (DWM: Flashback This statement, as well as one made to Victoria Waterfield (see below), make this very possibly the longest-lived of the Doctor's incarnation.

Second Doctor
In his second incarnation, the Doctor made the first direct reference to his age. To Victoria Waterfield, he described himself as something like 450 years old (DW: The Tomb of the Cybermen)

Seventh Doctor
By the time of his regeneration into his seventh incarnation, he is said to be 953, (DW: Time and the Rani) which by this date approximately 500 years divided between second and sixth incarnations.

Ninth Doctor
This incarnation claimed the younger age of only 900. (DW: Aliens of London) But then he also claimed "as he states "900 years of phone-box travel", i.e. travel in his TARDIS (DW: The Empty Child).

Tenth Doctor
The Doctor described himself as 903 years old (DW: Voyage of the Damned, etc.)