RE: Broadhead for my 10 year old???
Any quality two blade cut on contact. I personally like Steel Force heads, but all the others mentioned are good too. Also with that light of a draw weight don't go too light on tip weight and over all arrow weight. You will need the extra momentum for penetration.
Stay away from Mechanicals or large 3 blade heads. Remember more cutting diameter and more surface area equal reduced penetration.
And you want those babies SCARY sharp.
Paul