Usually women need to be at least 18 for legal purposes, and in some leagues they require you to be 21. I believe you can join younger if you have parental consent, but that is dependent on the league and their insurance carrier.
There are junior derby leagues, however, for girls under 18. There aren't as many of them, but it might be a good place to start if you aren't old enough for adult derby and there's a junior league near you!
Roller Hockey International was created in 1992.
Roller Hockey International ended in 1999.
13 players
Absolutely not! Although it isn't the real NHL, there is still checking, tripping (although illegal in the game, players still do it but get called). For example. My cousin plays roller hockey and he has a HUGE gash on his upper leg and its been there for a good 3 weeks. So yes, roller hockey is a contact sport.
22 for Ice Hockey
no.
13 players
Austrian Roller Hockey League was created in 1992.
Israel Roller Hockey League was created in 1957.
Mozambican Roller Hockey Championship was created in 1955.
Angolan Roller Hockey Championship was created in 1978.
Roller Hockey Asia Cup was created in 1987.