jul 6, 2022
Overview of study: High optimism linked with longer life and living past 90 in women across racial, ethnic groups (Harvard)
High Hopes: Optimism Helps Women Live Longer (HealthDay News)
Merriam-Webster definition of optimism
From a November/December 2021 study from the Survey Center on American Life -- "The survey asked respondents to think about the future of the United States and whether or not one is generally pessimistic or optimistic about it going forward. The national picture shows a fairly even split: Forty-seven percent of Americans are either very or somewhat optimistic while another 53 percent are generally somewhat or very pessimistic."