Don't know a guess 48 inces
Height. Not age.
It's not how old you are...it's how tall you are...if you have little kids there are doubles where 2 people can ride at one time but you can also ride so if you are a certain height
I believe you have to have a drivers licence or be at least 58" tall for the faster ones. They have double passenger karts so an adult can drive a kid above 3 or 4 yrs old.
It goes by height
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