Toddlers or Teenagers--which is better?

Yesterday afternoon I spent three hours at Adam's school helping the teachers with 45 kindergarteners. Normally I help for an hour and a half with about 22 students. So, I was a bit surprised when I was there double the time with double the students. Holy Hannah Montana!! I was so tired when I got home. I could never be a kindergarten teacher. They have the patience of saints and the stamina of the Energizer bunny.
Later in the evening, I heard Adam and Matt playing around in their rooms. I went to investigate and they were pretending to have big muscles. They had put on lots of shirts and sweaters; Adam had on nine and Matt had on six. It made me think of what they might look like as teenagers after going through puberty, and perhaps after a few steroids. Here they are showing off and flexing their "muscles". Matt calls this his "tough guy" look.