Hello!
I'm 38 yrs. old, I used proactiv about 5 years ago. It worked very well for me for about 1-2 years. After My skin got used to it, it didn't work at all. So, on to something stronger!! Overall, I do think it's worth trying, especially for a teen. People who don't have acne, don't know how AWFUL it is on self esteem, confidence, etc.
Good Luck!!
Cherie