Metamorphosis

MASTER: Time. It takes its toll on all of us in the end.

HARRY: Even a Time Lord?

MASTER: Especially a Time Lord. We live too long.

HARRY: Are you much older than the Doctor?

MASTER: No. We are the same age. That horrifies you?

HARRY: No! Well, no, it’s just… he seems so young in comparison.

MASTER: Time has been kinder to him.