A Brazilian couple has broken the Guinness World Record for the longest-living marriage in history after tying the knot more than 84 years ago in 1940. They share their simple secret to a happy union.

The longest-ever marriage recorded was that of David Jacob Hiller, born in 1789, and Sarah Davy Hiller, born in 1792. The U.S. couple were wed for 88 years and 349 days until Sarah's 1898 death at ...