I think there are some physical minimal qualifications to be able to throw an axe. For example, the axe throwing techniqie they teach requires a torso rocking movement, so if you have balence issues, that could be a problem. Also, its a 2lb axe, the taget is about 10 ft away. So need strength to through is that far. That being said, we had a group of 11, and we brought our 3 y/o with us. With close parental supervison, behind the fence, it was no problem (you can generally only have 2 people throwing at a time unless you rent out more that one cage. Hope that helps.
From their FAQ page: "We do not have an age policy but we would like to see if they can throw a 2.5 pound axe to a distance of 10 feet."
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