Okay since it says to ride a double ride with a 16 year old you have to be at least 2 years old , if your 16 and want a 15 year old to ride with you could they ? or since they’re 15 can they ride by theirs selves ?

To drive a Single Kart, you must be at least 8 years old AND 54 inches tall. If you don't meet those requirements, you can ride with someone 16 yrs+ in a Double Kart. The minimum age for a Double Kart rider is 2 years old. If you are eligible to drive a Single Kart, you can not ride in a Double Kart unless there is a disability that renders them unable to drive by themselves.

Yes it should be okay as long as a adult is present

I'm pretty sure they allow older people to ride doubles too but if your up for a friendly competition singles are the best!