let me start of with my story. I'm nearly 20, and I started noticing hair loss around 17 (although minor). My grandpa on mom's side said he started losing his hair around high school (like me) and he was almost completely bald by 30! I've let my hair loss progress but now I'm starting to take action before it's too late. I ordered some generic proscar and picked up rogaine foam last week. I first applied the rogaine to my temples five days ago, and I am already seeing new hairs grow! I just counted over 30 tiny dark new hairs on my temples. Hopefully this trend continues and I get most of my hair back (i'm ~nw1.5). I am very excited and looking forward to more progress!! I just wanted to let everyone know that this stuff can work FAST! 
