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Living longer may be correlated to optimism, stubbornness and bonds with family, religion and land, according to a new study.

Research in International Psychogeriatrics examined why several hundred citizens over age 90 are clustered in a small Italian village. The University of Rome La Sapienza and University of California-San Diego School of Medicine researchers identified common traits.

They found positivity, work ethic and strong bonds with family were tied to better mental wellbeing even if the participants had worse physical health.