Grown up conversations

It seems like more and more we are having real conversations, and frankly they amaze me. This morning's:

K: So, what are you doing today Mommy?

M: well, right now I'm watching Sophia with you. Then I'm going to the gym and then we are going to the Zoo later.

K: ok, that's a good idea. Then I will come home and read a book and a magazine. 

When did they get so big??