How old should you ride the roller coaster

It's not about age is all about how tall you are.

I believe it's 3ft that you have to be to ride some coasters

I'm not sure on the age but I think you have to be at least 4 feet tall to ride the roller coasters (I believe 4 feet is the minimum height. If you're shorter than that, you can't ride.)

how tall should you be to ride