At some point, one has to face the harsh realities of age, when the body just can’t muster the strength to meet the challenges of the day.
You fight it as long as you can but, sooner or later, the ravages of time set in. Your doctor ends every sentence with “for your age.” The waitress at the restaurant doesn’t even ask if you want the senior discount. She just gives it to you. The teenage hardbody who would have sent your harmones raging 40 or so years ago looks at you and says “gee, I didn’t know men’s chest hair turned grey too.”