'If he's good with that, you can get him a mule.'

One little guy (six years old) says, "I'm six."
I say, "Wow, when was your birthday?"
"Yesterday,"
Little guy is counting on his fingers.
"I only have four left."
"Four left for what?"
"Until I'm ten."

Another little guy says,
"You can get him a go-cart. And if he's good with that you can get him a mule."

Grandma says,
:"He means a four-wheeler."

I conclude you can drive a four-wheeler when you're 10?