The term "Blue Zone" was coined by a Belgian demographer, Dan Buettner, who studied long-lived people. He has visited four groups of them in Sardinia, Okinawa, Costa Rica's Nicoya region and Loma Linda, California.
Canada may have it's own "Blue Zone" on the South Shore of Nova Scotia, with pockets of extreme longevity and more centenarians than elsewhere in the country. Across Canada, centenarians average 14.6 per 100,000; in Nova Scotia it's 21 per 100,000.
William Walker, 101, shown in the photo, is just one of several centenarians featured in a recent article in The Toronto Star.