I can see you haven't had too many 8 year old girls shooting archery equipment.[8D]
Heck,I still have my son's bow on 22#'s.(actually getting ready to increase it over the next few months)IMO,it is much more important to teach shooting fundamentals at very comfortable weight.I tried to bump it up for him but he was going to be overbowed so I decided he needed to wait another year.
We don't have a minimum requirement in Ky,but I have mine.