Tennis brought the Atterberrys and the Helgesons together decades ago.
Ever since, the Minnesota couples, now in their 70s, have been meeting on the court — through retirements and knee replacements.
"Tennis can be very social," said Dick Helgeson, who lives in Orono with his wife, Jean.
Researchers say that social aspect may be more important to a long, healthy life than most people realize.
A recent, observational study published in the Mayo Clinic's Proceedings journal found that the social facet of the sport may give it an edge over other sports in promoting longevity.
The international research team took a Danish population study, which tracked thousands of men's and women's sports and exercise habits over 25 years, and compared it with death records. They found that playing tennis created the biggest gain in life expectancy: 9.7 years compared with folks who said they were sedentary.
That gain is even more striking when compared with other active but less social activities, such as swimming (3.4 years) and jogging (3.2 years).
"Surprisingly, we found that tennis players had the longest expected lifetime among the eight different sports," the researchers concluded.