New research has shown late-onset or adult-onset acne is becoming increasingly common in women in their 20s, 30s, 40s and even 50s. Acne affects over 50 percent of women between the ages of 20-29 and over 25 percent of women between the ages of 40-49. This same research also found that women are more affected by adult acne than men. Here are ten myths and then the facts about adult acne: Adults don’t get acne. Not true and it may look different, more like reddish nodules around your mouth and jaw. Eating chocolate and drinking soda gives you acne. The idea that chocolate and caffeine cause acne has never panned.