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Here's a surprising report from AAD.org:

While acne typically first appears during adolescence, hormonally influenced acne usually begins in the early-to-mid twenties and can persist well into adulthood. The cause of hormonal acne is most often linked to androgens, which are the hormones that stimulate the sebaceous - or oil - glands and hair follicles in the skin. When the sebaceous glands are over-stimulated by androgens, acne flare-ups can occur. Nearly half of all women experience acne flare-ups and increased facial oiliness during the week preceding menstruation. Dr. Berson emphasized that while most women with acne have normal androgen levels, some women may have a more serious medical condition for which acne is just one symptom.