Yup. He's officially a teenage boy.

We'd all finished supper before Elder Son finished soccer practice. When he finally got home, The Husband and I piled a plate full of food and placed it (along with seconds and thirds) in front of him.
After a while, Elder Son joined us in the livingroom.
"Are you done eating?" I asked, thinking I'd clean up and put away any leftovers.
"No," he answered. "I'm just full. I'll go back in a minute."

Uh. Yeah.
Darned stomach. Gotta stretch that thing out some more.
*sheesh*