Ziplining in Gatorland

[ntalan]

My turning-10-year-old wants to do the ziplining at Gatorland on his birthday. My concern is his 6-year-old brother, who I'm afraid will say he wants to do it, and then get there and change his mind and there's $70 down the drain. There's a picture on their website of a kid and father together, does anyone know if there's an age limit for that? I'm sure he'd be much less scared if he was with his dad or me.