Edna Parker, a widow for 68 years, just celebrated her 115th birthday. Has her lengthy single status contributed to her long life?

A recent news report says we get happier as we get older , and if it's true 115-year-old great-great, grandmother Edna Parker must be the happiest person on earth. Edna, who was born in April 20, 1893, just celebrated her 115th birthday. She's probably WAY past lying about her age since she hasn't seen 40 since 1933.

The key to her longevity is not known, she was raised on diet of starches and meats, and contrary to popular belief that married couples live longer, she has been single since 1938 when her husband, Earl, passed away. Happy Birthday, Edna. You're an inspiration!

What do you think is the key to longevity?