Well I think, the people telling you this is a disaster waiting to happen, and the people saying teach and trust both have valid points.
At that age I was running around the bush with my mates carrying sharp machetes knives, hatchets, spears, and apart from a few stitches and scars we all survived.
But as farm kids we were shown how to safely, carry, swing, chop, handle, pass tools to people safely, from an even younger age,with bladed tools of all sorts.And watching what they were used for gave us a healthy respect for how devastating the injuries could be.
The advice my Grandfather gave when I was little older and got my first shotgun, has always stuck with me when the subject of young boys and weapons come up.
"One boy with a weapon, knows what he is doing.
Two boys with a weapon, one boy knows what he is doing.
Three boys with a weapon no *!@#$#* knows what they're doing."