age

Me:  B, what do you think you'll want to be when you grow up--what do you think you'll want to do for work?

B:  Ummm, maybe be a teacher.

Me:  A teacher?  Really, well that would be cool, teachers help kids to learn and they get to spend the whole day with them.

B:  Yeah [purses lips, squints one eye thoughtfully], I think I would like to do that when I turn one hundred...