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When looking at the context of that quote from "School Reunion" when the Doctor is trying to get Rose to understand why he eventually leaves all his human companions behind, the Doctor doesn't mean that he doesn't age literally, just that he ages a lot slower as compared to humans (so from their perspective he doesn't age because his aging is so comparably slow) and that the process of ageing ends in regeneration and a whole new life instead of death. In fact, the Doctor has been seen to have aged many times throughout the course of the show, including having seen the Doctor as a child ("The Sound of Drums") and comparing that to the age of the First Doctor upon his regeneration, as well as having 3 Doctors die of old age; the First Doctor ("The Tenth Planet"), the War Doctor ("The Day of the Doctor") and the Eleventh Doctor ("The Time of the Doctor"). In fact, Eleven is seen to age very visibly over the centuries in "The Time of the Doctor", although this if further proof of his slower aging since a human wouldn't have survived anywhere near the length of time that the Eleventh Doctor did.