Most teenagers have some acne.
However, adults in their 20's, even into their 40's or older, can get acne. Acne often clears up after several years even without treatment, but you need not wait to outgrow it. Untreated acne can leave scars, which can be treated by your dermatologist as well. While not a life threatening condition, acne can be upsetting and disfiguring. Acne can also lead to serious and permanent scarring.