IF your local laws allow it, and IF the child is responsible enough, then 8th grade is plenty old. I was climbing trees far more dangerous than any
catwalk at ages much, much younger than that. I hate to say it, but first you must indemnify yourself legally and then you can look at the qualities of the child (ie are they able to follow directions completely, are they
clear on what you mean by
safety first).
But you MUST supervise them very, very closely. A couple of stories.
I taught tech at a fine arts academy down here. We have a unique setup. I was a TD and responsible for teching shows and teaching responsible students skills like electrical, rigging, carpentry,
etc. There was another teacher who took the rest of the kids and basically did arts and crafts. Well, one day I was out in the middle of loading in a show. I told the other teacher not to touch anything while I was gone. She decided that she could get some drops hung while I was gone, and allowed the students to do it. Now these were my students, and the responsible ones of the group, but without my supervision they got the loading order confused. They flew in the pipe, then loaded the
arbor, and well you know what happened next......
Another day we were hanging lights out front and I thought she had her crafts kids in the other room working on stuff. Well, I hear a thump, thump, thump coming from the scene shop. I run in there, and one of the kids has taped the
safety on the
nail gun and was shooting nails at a 2x4 on the opposite side of the room.
Kids, no matter how responsible, have to be closely supervised.
Mike