Researchers have found some very good reasons to play bridge:

Those who play more frequently score higher on cognitive tests.
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Bridge games offer intellectual and social stimulation on a routine basis.
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An area in the brain used in playing bridge stimulates the immune system. Researchers suggest that is because players must use memory, visualization and sequencing.
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Any activity from which you derive pleasure prevents the onset of classic depression. Players are less likely to be depressed; hence, they sleep better, tend to exercise more and have a better life in general.
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Multiple changes in lifestyle (e.g. cognitive training and social activity, two of bridge’s chief benefits) can improve memory and thinking in those at risk for cognitive decline.
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Playing bridge can help older people retain their mental sharpness.
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The frequency of playing games is associated with greater brain volume in several regions that are affected by Alzheimer’s disease.
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Successful people play bridge! Warren Buffet and Bill Gates are considered to be two of the smartest entrepreneurs in America. Both are also very accomplished bridge players.

Hall of Fame tennis star, Martina Navratilova writes that bridge “is more than just a card game. It’s a cerebral sport. Bridge teaches you logic, reasoning, quick thinking, patience, concentration and partnership skills.”

Summarized from an article in the AARP (American Association of Retired Persons) Bulletin:
“A Bridge to Brain Power” March 2015

Here’s another article in the AARP Bulletin, related to bridge:
Bridge Games Thrive Online Amid COVID19 Precautions June 25, 2020