Yes, you've got to be at least 18 years old in order to participate. We don't have a maximum age, but if you're over 65 we definitely recommend checking with your insurer to make sure you qualify for the medical insurance you'll need to take part. The Challenge is physically tough, but by no means extreme, we won't sugar-coat it. You should really only take part if you're in decent physical shape and your health is A-Okay.