Kansas couple Melvin and Doris Cornelson died within hours each other after 62 years of marriage, reports local news station KWCH. Melvin, 85, suffering from cancer, died with his wife by his side. Hours later, Doris, 80, lay down for a nap and never woke up.

“They never dated anyone else,” the couple’s daughter, Candi Sawatzky, told KWCH. “They’re happy. I know they are.”

The Cornelsons aren’t the first long-married couple to die in close succession. In fact, it’s a surprisingly common phenomenon.