I found this web page quit interesting..it is loaded in my opinion with some good information. It has some good ideas and thoughts on selecting ATVs for youths and how and what to look for...I'm sure we could all add to the findings but it is some good info for those new to the sport.
http://www.cdc.gov/nasd/docs/d001801-d001900/d001829/d001829.html (http://www.cdc.gov/nasd/docs/d001801-d001900/d001829/d001829.html)
Good page. As long as 10 year olds aren't riding banshees and big ute quads i'm happy!