I've no idea whether my pubic hair might have any grey in it, I've been smooth there for ages, I haven't let it grow for about 20 years. In recent years I've got some grey head hairs so I might have some grey pubes now, but I'm unlikely to find out as I like being smooth.
I love being TRIMMED bush wise and SHAVED in regard to balls...I have multiple body piercings and they look better on shaved balls.. I also rim LONGER chest hair--don't shave it-- just neaten it up like a trim over your ears...It is just preference-- I love the look of a HAIRY man and equally think that completely shaved men can be attractive too-- like a shaved head vs long hair on a man. If you like what you look or feel like do what YOU want to do....Used to be uneasy if seeing the urologist-- I tend to let a little growth sprout out if heading there---just a quirk on my part I guess.. He KNOWS I have piercings, but I remove them for ease in his exam of penis and testicles....He is not judgmental at all and just takes it all in stride. Guess he has seen everything.
I just tried it once and liked it but like my beard I let it grow get sick of it and try something new. I shaved from my neck to the top of my legs and wish I knew someone well enough to shave my back I feel better and think it looks better.
I initially started trimming my pubes so they would not stick out of my swimsuit. Then when I started wearing smaller coverage swimsuits and went to thongs and then G-strings I trimmed more and more. I had a gf who bought me a sheer G-string to match here for a vacation and after getting them wet and see through we both went to the room and shaved it all off. This was 27 yrs ago.