I just had my 7 year finasteride *burp*anniversary and it's still doing its job for me. I started popping at 19 and now I'm 26 with a good head of hair. I still have receding temples and I do believe my hairline creeps back year after year, but the chnge is VERY slow and I look pretty normal for someone in my mid 20's. At 19 , at the rate of loss I was having, I would have been a bald jackass by now.
One guy on here has been using for 12 years now and he's pretty much maintained what he has.