Mine is a bit shorter than in my picture, finally found someone who can cut my hair the way I like it, had to raise her though, but she knows how Dad likes it.
I tend to let it grow over winter, but like to keep it so it stays out of my mouth. T'was long one time years ago back when I hunted geese, pulled a big bunch out when it got between the butt of the 10 and my shoulder on a quick shot, 2 1/4 oz of lead #2's pulss a bit. Try to keep it shorter in summer, hate to see the Cosie go up in flames.
Till a bit over a month ago, there was a touch of grey in it and the stash. Got up the morning after the last surgey and oh y gawd, about half was grey.
Bottom of the stash is grey and if I don't keep my chin shaved it really shows.