"Many experts described later life as embodying a serenity, a 'lightness of being,' a sense of calm and easiness in daily life that was both unexpected and somewhat difficult to describe. . . . They acknowledge that growing old is uncharted territory . . . but many experts described it with a sense of exploring a new land."
#12 on a list of "12 ways to live a better life."
Related is #2: "Act as if you will need your body for 100 years/Don't worry about dying. Worry about chronic disease...."