Sound sleep in young and middle - aged people helps memory and learning, but as they hit their seventh, eighth and ninth decades — and generally don't sleep as much or as well — sleep is not linked so much to memory, a Baylor University researcher says. (sciencedaily.com)
They are remarkably intact mentally, and up to 90 percent of them can function independently into their ninth decade. (discovermagazine.com)
Now entering his ninth decade, American composer Steve Reich is always looking ahead. (npr.org)