About 20% to 80% of women develop fibroids by the age of 50.   Globally in 2013 it was estimated that 171 million women were affected.  They are typically found during the middle and later reproductive years.  After menopause they usually decrease in size.  Surgery to remove uterine fibroids occurs more frequently in women in "higher social classes".  Adolescents develop unterine fibroids much less frequently than older women.  Up to 50% of women with uterine fibroids have no symptoms. The prevalence of uterine fibroids among teenagers is %.