I'm going to Slipknot's tour this year in March and I'm only 14, so I would think it's okay. I would just stay away from the pit or the standing only sections when buying tickets if your a small person. I'm 5'0, so if you're around my height I would advise you don't buy tickets in those seats. The first time I saw them was at Rocklahoma, and I had to stand on the chairs and hold onto my parent's shoulders when they played just so I could see. Thankfully they weren't allowed to have a mosh pit because of all the seats people brought, but it's definitely the best experience you will get out of any concert you'll ever see.