Growing up too fast

Garrett is all about being a big kid lately. He really admires the school-age kids at daycare. He tells me that he wants to go to school and he wants to do homework. Hopefully he'll still feel this way in a few years! He's excited that he is "older" since his 4th birthday. This is our conversation the other night as I was tucking him into bed:
Garrett: I'm a lot more bigger when I'm 4. Can't I stay up later?
Mommy: Maybe you can stay up later when you are 5 or 6.
Garrett: Ugh.
Nice try.

This was a night when he was being particularly silly. He also said, "I'm older than you." I said, "I'm 31. How old are you?" He replied, "34."
He was full of giggles that night. I'm not sure where this came from, but he kept asking me to "Shake my sillies out. Shake my sillies out!" I obliged.