Hello my friend, I hope you are doing alright. Your fear is actually not on growing old, but on the challenges old age brings. Many many steemians fear old age for the same reason, but I think we ought to replace that fear with courage and gain focus to prepare for such times. Smiling helps reduce wrinkles on the face, and as a result slows down the aging process. Also, walking like you listed, helps the body both in young and old people. I enjoyed your entry, have a blessed day