Lisa, you're old enough to have watched Danny Kaye/Curd Jurgens in "Me and the Colonel". Danny was fond of saying, "There are always two possibilities..."
That's where you and I are now.
The alternatives are to slowly sink into a mire of woolly mindedness and physical trauma, or to do something about it. People like George Bernard Shaw and Bertrand Russell were writing successfully into their nineties. Our brains don't have to atrophy. Senior's moments? Of course, we all have them -- but benign forgetfulness doesn't need to end in dementia. Using the brain is a good way to keep it young and active. and Ask is a great place to do that.
And you need top keep fit, even if it's only walking, and even if it hurts. Old age isn't for wimps.
I met a guy named Bill Empey who finished second in the 100m at the World Veteran Games one year. I said, "You didn't win this year, Bill?" He replied, "That young fellow from Taiwan can still get down in a crouch start, and I couldn't catch him."