'Don't worry, be happy,' is more than just song lyrics. A growing body of evidence supports an association between optimism and healthy aging, but it is unclear how optimism impacts health. When it comes to dealing with day-to-day stressors, such as household chores or arguments with others, a new study has found that being more or less optimistic did not make a difference in how older men emotionally reacted to or recovered from these stressors. However, optimism appeared to promote emotional well-being by limiting how often older men experience stressful situations or changing the way they interpret situations as stressful.