"Not a bad plan, I'll give you that." The Doctor admits, secretly planning to do much the same. However, he isn't planning to ask everyone how old they are.

"Ah, now that is a complicated question." He claps his hands together, standing up a little straighter. "The short answer is no, not really. Timelords can do this unique thing called regenerating and basically-if I'm close to death, I can change every cell in my body. It's a lottery though-you never know what you're gonna look like next."