I realized today that old is subjective and even though someone may be older, they don't have to be old.
Case in point: I was waiting to check in for my eye doctor's appointed this AM for a typical extra long appt with field of vision, glaucoma tests, etc. It was taking forever because all these old duffers in front of me were aimlessly shuffling about, had no clue where any of their paperwork was, etc. Good grief.
Now, I know "there but for the grace of God go I" and I am not disrespectful in the least. I open doors for old people, tip my hat, let them in line in front of me, etc. But when they give their DOB to check in and I find out I am OLDER than them, sometimes by a lot, it is concerning.
You've got to put some spring in your step, wake up every morning with a vision of what is to be done and how to do it. You have to hug the dog, cut and chip brush, saw stumps, change oil and clean part of the barn. Let's turn that frown upside down

and get crackin' in life.
When Clint Eastwood was asked how he remained so spry and accomplished in life, even at age 94 he said he simply "didn't let the old man in". And he doesn't. If I couldn't bite, scratch and kick below the belt, he could probably even whip me in a fight.