True, but I've seen gray hair on kids as old as 15 - a head of hair "is da sexy"! Doesn't matter what color - if it works for your complexion & you evolve the piece as your face evolves, that's the ticket.
I know for me, I went from a very low density piece, which was great, to a higher density, but still lower than most of you guys. I simply cut my sides & back shorter, so that the higher density with product in it to show a bit of scalp, looks great....I get that cop ( but not boot camp) type of look that fits my face & physique. The 20% gray fits too, when I don't keep religous on the dying of my sideburns & mustache.