Before my wife died, she had been trying to get me to grow my hair back into a ponytail. So, afterward, I tried to grow it back out. At the time I was about 65 and after about 2 months I looked at myself in the mirror and I looked like I was 90. Part of the problem was that there was no hair on top and the toilet seat was gray to white in color. That combination accentuated the cracks in my face that I believe the ladies call wrinkles.
At that point I shaved it off. I have been sometimes negligent over the ensuing years with my shaving but never more than 4-5 days.
I would not attempt this again. Now I'm 71 and I don't look a day over 70. I credit grape scraping for my youthful good looks.