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Men for some reason don't seem to have a stereotypical norm to try and fit into. Their hair goes gray and they are "distinguished".  

How many hair colour commercials are on during an hour long tv show? It seems like every other one. Who are they geared to?  Women!   If a woman doesn't colour her hair to hide the gray she's "old".

Actually, when I've seen hair colour commercials it is not what you describe at all.  Men's hair commercials, and there are quite a lot, are without exception about hiding gray hair.  Women's rarely, if ever, mention gray hair at all: they're about changing the colour from brunette to blonde or red, or red to black, or whatever.  The subtext in men's commercials is about looking younger, that in women's about looking stylish.

I don't know how you've never noticed the commercials of men stroking colouring to get rid of gray streaks in their beards or magically having hot young women hanging over them because the brown is back.