Erika: Why doesn't Lena [a 20-year old] drive a car?
Me: Because she doesn't have a license.
Erika: Why doesn't she get a license?
Me: Because she doesn't know how to drive a car. She never learned how to.
Erika: Why?!
Me: Well, do YOU drive a car?
Erika: ... But I'm a KID. I'm not old enough.