My guild has an age limit of 50+ but it's in a senior center. Occasionally someone will bring a granddaughter or relative that is younger but that's not a problem. We don't have the small child issue but if that's your concern definitely put it in the bylaws that no children under a certain age are allowed. Small children can be disruptive and could get hurt. Some parents don't disipline their children as they should and allow them to run wild.