i was 17 and my girlfriend, as well as my barber, were telling me it was getting thin. the barber got alittle more technical about it though of course, telling me i had alopecia. by 18-19 i had the same hairline i have now, which is basically a non-existent one! it just started falling out all over my pillow and in the shower every day my senior year in HS. been bald all through college. boy how times change!