Great question. Acne breakout peaks in females is 14-17 while in boys it's 16-19. 50% of women have adult acne while only 25% of men> 20 will suffer of acne. While adult acne is more prevalent in women, males may have folliculitis in their shaving areas on the face and neck, resembling acne. This may last for longer periods tie well into their 20s and 30s.