If we go back 20 years, yes it did affect boys more.  However, now as girls are getting more active and in fact more “sports oriented” than boys we are seeing it equally in both genders.  It still is most commonly seen in children ages 8-12, sometimes as late as 14 because this is when the growth plate opens and then of course closes.  Lately we are actually seeing "Sever's", or an inflammation of the heel growth plate, more commonly in girls! 

Dr. Misty McNeill
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D.P.M. - Founder of Prairie Path Foot and Ankle Clinic