“There is quite a bit of evidence now suggesting that the more people you have contact with, in your own home or outside, the better you do” mentally and physically, Dr. Kawas said. “Interacting with people regularly, even strangers, uses easily as much brain power as doing puzzles, and it wouldn’t surprise me if this is what it’s all about.”
And bridge, she added, provides both kinds of stimulation.
“People stop playing,” said Norma Koskoff, another regular [contract bridge] player here, “and very often when they stop playing, they don’t live much longer.”
—At Bridge Table,
Clues to a Lucid Old Age
New York Times