Im 25 years old. And I dont know if its of interest or not, but I never had much of the "teenage acne". I mean, I had a zit here and there, but I never had bad Acne til I was older, exposed to a lot of animals {worked at an animal shelter, and thats one reason I suspect demodex}, and also, when I got on prescription birth control pills. I was on them a couple years and NEVER had bad cystic Acne til then. But I was also doing all that bad stuff during that time so maybe its not one thing but many.