Your knuckles drag on the ground when you walk, and you throw handfuls of your own faeces to chase intruders off your territory.
I've got quite a few grey hairs on either side of my head, but they are usually hidden within my locks of luscious hair. As for the pubes, still dark. Every so often there will be the odd long white one that seemingly appears all of a sudden (cue knob jokes).
I started going grey in my early 30's. Mibby even before that. My da was early grey too. Now I'm what is apparently known as "salt'n'peppa" - equal amounts of my natural hair colour and grey. My pubes, as of this posting, show no signs of any grey. But I keep them trimmed right doon to the wid, so mibby I should let them grow out so I can find out for sure. It's information like this that keeps the world turning.