"Stop assuming positivity is required for longevity Researcher Susan Pinker visited Sardinian centenarians and found that personality type alone does not determine lifespan. She met Giovanni Correa, described as "the grumpiest person I have ever met," who lived past 101, demonstrating that a cheerful disposition is not a prerequisite for a long life. What matters more than attitude is the presence of people who value and care for you — Giovanni's niece called him "El Tesoro, my treasure" and considered caring for him "a huge privilege." Anyone overhauling their lifestyle purely to become more optimistic can redirect that energy toward building caring relationships instead. Source: Susan Pinker, TED Talk, The Secret to Living Longer May Be Your Social Life"