Optimism is lowest in people's twenties, rises steadily into people's thirties and forties, peaks in people's fifties, and gradually declines after that, suggests new research (n=1,169) that charts the trajectory of optimism over the lifespan, which found people experienced peak optimism at age 55.

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Optimism is lowest in people's twenties, rises steadily into people's thirties and forties, peaks in people's fifties, and gradually declines after that, suggests new research (n=1,169) that charts the trajectory of optimism over the lifespan, which found people experienced peak optimism at age 55.