No, I mean scientifically what is it about peanuts that causes the reaction?
Essentially your immune system develops in a way that it should recognize anything foreign (e.g microbes, but food is the same) and react to it. For food however, mechanisms take place to prevent it. That's called tolerance. If it doesn't work properly, you get an allergic reaction.
Delaying the exposure to such things quite dramatically increases the risk of allergies.
So basically, you should have your kids eat everything at a young age.