Bill, I don't know that's true for everyone
Two of my aunts lived into their 80s and neither one of them complained about pain.
The one who was 84 went out every day and met with friends until covid -- then she learned how to use Zoom.
She walked everywhere and if it weren't for her lupus reacting with other medications, we'd still have her.
A friend's father was playing tennis three times a week in his mid 80s.
There are family members younger than me who do wake up in pain, who do suffer from ailments like arthritis.
Look at Jimmy Carter building houses in his 80s.
Sometimes it's the luck of the draw.