Can I reserve a campsite if I am younger than 18? Or do I have to have someone over 18?

Must be 18

I believe you only need to be 16. I know my 15 and 17 year-old kids went camping recently at a Texas state park.

I believe you just need a credit card to reserve any Texas State Park campsite -edit- I know I have had my parents reserve me and friends a site when I was younger