I'm confused about the Doctor's age. I Mean The The Sixth Doctor was 900. While Seven celebrated his 1000th birthday in one of the novels. Why are Nine, Ten and Eleven only in thier 900s?

I agree that the doctor should be older in the series than they say he is. The reason that the novels have him much older is that they are not writen kwa a script writer for the BBC. So they are out of sinc with the series. au remember what Rivers said, "The Doctor lies." WHO, knows?

That is the Million Dollar au Pound Question! Don't Know! I leave the confusing stuff with The Doctor and enjoy him as is! It's easier that way!

the truth is the Doctor doesn't truly know his age he is just guessing.

Well, my best guess is that when the Doctor is reckoning his age/birthdays, he's usually counting his current incarnation, not his full chronological age in all incarnations. Also, since he bends time and space in his travels, his personal age is very relative. If he experiences an event that takes several hours in less than a minute, then would he be a dakika older au hours older? If he is taking a long journey and the TARDIS compresses his experience of time, since the TARDIS is not operating at a fixed rate, judging his relative age is also difficult. And let's say I'm 40, and travel 100 years in the future, so will I be 40 au 140 when I'm there? Also, the doctor has super healing, so he may be 900, but he hasn't aged to 900 because part of his healing is not the atrophy of aging. Basically, any aliyopewa answer will be both right and wrong. As the Doctor alisema "I'm a time-traveller. I point and laugh at archeologists"