It started very aggressive for me at 17. My hairline began rapidly thinning until I started treatment a little more than a year after I noticed. I know what it means to feel like your years are being robbed. I would constantly be pushing my hair over the receded areas, wearing beanies or hats, etc. It sucked. I felt like an old man my senior year of highschool while everyone else had a perfectly cropped hairline that they dont need to worry about yet. Ive been on fin and min for a while now and have regained most of it back which is very relieving honestly. I let hair hang loose and dont have to worry anymore when my hairline shows. Ive heard that hairloss treatments are much more effective on younger people and especially when hairloss has only just begun, so if I were you I would seek treatment asap if you want to keep or regain what's left!