[Pilouette thinks hard about that for a second. It's...kind of a vague concept, isn't it? She's never been too terribly good with abstract philosophical concepts and this is no exception. She crosses her arms and frowns thoughtfully. She's trying to give this some deep thought; after all, Lee makes it sound pretty important.]

It's kind of hard to define something like that, isn't it? Like, when does youth begin? And like, when is it over? Like, do you just decide something like that or does it just happen?

[She is likely completely over-thinking this. If she were to think any harder, smoke might start coming out of her ears.]