My oh My! I didn't realize that I had so many nephiews.
Thanks guys.
Something that I didn't mention was that many people give a knife to their kids and, even if supervising them as they use the knife, they don't give proper instruction in healthy knife techniques. Usually I think it is because they don't know them themselves. I didn't know proper knife techniques and different knife grips to prevent injury, and increase control, until I was about 25.
Everyone knows that you generally don't cut towards yourself, but that is just the beginning.
You can still injure yourself, or someone else, real easy cutting away from yourself.
Some easy points that I find useful are these.
*To increase control on fine work use some fingers from your other hand to guide and push the blade. This will prevent dangerous slips because it is also gripping the thing that you are cutting.
*When using one hand to cut keep the cutting arm as straight as possible so if something slips (murphy guarantees that it will
) the knife does not move far at all and you have the most power in that position too.
*If you absolutely must cut toward yourself, use only the wrist to move the knife, if you slip it won't move far either. Or if you have to use the arm, then hold the knife so that if you slip your fore arm or elbow contacts the body first and stops the motion of the knife.
*I also keep a mindset, as I'm sure most of you do, that I consider where the knife will go when it slips. If I could possibly get cut or cut something else I will change my grip or motion of the knife.
If simple rules like this are taught to young kids then they will be safer with their knife than most adults.
I agree with the other comments, teaching a kid to be responsible and to think before he acts with a knife will make a good foundation for many other things in their lives. If they have good motor control, can think things through carefully, and if they obey you, then they are ready for a knife no matter what the age.
I hope that helps someone out there.