Hi Pamster,

It's not uncommon for kids on the spectrum to demonstrate increased aggression as testosterone starts surging, which can happen around age 9 - 10. Even if you don't see any obvious signs of pubertal development, a lot is happening behind the scenes before the hair & whatnot are evident.

While many folks have had success with biomedical approaches in autism, if aggression is severe in most cases medication is required -- sometimes temporarily (in biomed), or long term, if conventional treatment is undertaken.

Best wishes.