The majority of us do tend to have hair that grays or recedes somewhere in that time frame, unfortunately, which gives a bit of an idea. And I think most men do not consider the possible ways to remedy those things in the norm of "taking care of yourself."
Hell, most men don't consider lotions, so that much makes sense.
I see guys with skin of dry and cracked the hands look like dry riverbeds. Hell, some look like a series of canyons carved by rivers.
That's risking things to much. But then again, if I don't use lotions, I can't even get to THAT point before I get bloody spots on my knuckles or webbing between fingers.
I've also vowed to take care of my body in every way I can think of, which in some ways is simply skin-deep, others are more rooted... simply because I don't want to be an old wrinkled and bed-ridden mess when I'm a senior citizen. I want to still have muscle definition, still be able to run, and keep up with or, hell, beat the lazy youth when it comes to fitness.
Being able to do that is possible for many people, but not if you neglect your body until its too late. Bones and joints alone will be too unforgiving with too much neglect, to the point recovering to peak form is impossible.
Of course, various diseases and defects can crop up no matter what the hell you do in life, but for some, it's simply neglect.
I'm actually starting to enjoy strength training and running, versus having done it these past few years out of necessity alone. I hope to keep this up, while slowly try to keep improving my nutrition, for as long as I can. Here's to hoping my efforts pay off and I can still run comfortably (and maintain a good physique, not anywhere near what I want just yet though) when I'm old and retired (if I ever get to retire ).