In my league, minimum age is 18, The oldest in in her 50's
Yes, most amature leagues minimum age is 18, however, if you live in the states and you are a girl, aged 12-17 you probably will find a team of 'derby brats' near you (a junior league to train and play in until you are old enough to try out for the big league) However, if you live in Canada or anywhere else, you probably will have to wait until your 18.
Maine Roller Derby was created in 2006.
Copenhagen Roller Derby was created in 2009.
Montreal Roller Derby was created in 2006.
Memphis Roller Derby was created in 2006.
Providence Roller Derby was created in 2004.
Greensboro Roller Derby was created in 2010.
Stockholm Roller Derby was created in 2007.
Roller Derby Brasil was created in 2011.
Roller Derby France was created in 2011.
Roller Derby Germany was created in 2011.
Helsinki Roller Derby was created in 2009.
Tucson Roller Derby was created in 2003.