Such was the advice my father used to give when talking about the frailties of his aging years.
It was partly an attempt at humor to change the subject. Dad didn't like to complain. Even though his health deteriorated pretty steadily over the last 22 years of his life (after a stroke) until his death from (officially) starvation. There was a long way to go from the vibrant, healthy, strong man's man that I knew growing up, and that few of his grandchildren can remember.
Sometimes, I find myself telling my own children, "Don't get old." But, I always try to catch myself, because the only alternative that I am aware of to growing old is to die young. And that is something that I honestly can't wish upon any of my children. Or nieces, nephews, and grandchildren.