At the ER this weekend, we had a case with a family involved. There was a mom, and a dad, and a particularly good little boy.
As we were finishing up, I asked the boy how old he was. He proudly held up four fingers. He added "Then I'll be five, then I'll be six,..." etc. When he got to ten or so, I asked him, without thinking, if he could count up to my age.
The lad looked shocked for a moment, then said "NO!"
I should know better by now.