That's hard for me to say, since I don't age. A more significant amount of time would have to pass before I'd be able to see a change in one of you, as well.

It is an interesting question, though.

Interestin'. Soooo, if your life never ends... d'ya judge the passage of time based on other people, then?

I judge the passage of time in relationship to historical eras. For example, the Victorian Era, or the Industrial Age, or the Cold War.

Until recently, I could not have much contact with humans, so basing it on their passing lifetimes was impossible. Most of them died too quickly regardless, especially before the invention of modern medicine. It's a bit different now.

Righ'.

[It's interesting to Rose to meet someone as old as The Doctor, who spent all of those years on Earth and Earth alone.]

Which was your favorite? Or should I assume tha' none are your favorite when ya live concealed?