Leah and Mary are playing together in the other room. Mary is deciding to assert her ownership over a few My Little Ponies, and Leah is becoming more and more upset. Finally I hear Mary concede:
Sure, you can play with them, Leah... when you're grown up.
But Mary! (she's working herself into tears) I won't be grown up for years. It is going to be at least 20 years before I am grown up!
I know. (Mary says - nonchalantly and without a hint of pity) You'll just have to wait.