Little is known about early-life experiences that may lead to higher optimism levels in adulthood. Using data from 202,898 adults in 22 countries, we evaluated childhood candidate antecedents of optimism. We examined the associations between retrospectively reported childhood experiences and adult optimism levels in each country separately, and cross-nationally by pooling results across countries. Our pooled results suggest that higher adult optimism levels were associated with childhood experiences of having positive relationships with both parents, higher subjective financial status, better childhood self-rated health, frequent religious service attendance, an earlier year of birth, and being female. Conversely, lower adult optimism was associated with childhood experiences of parental divorce, abuse, financial hardship, and feeling like an outsider in the family. However, country-specific analyses showed substantial between-country variations in these associations, suggesting diverse societal influences. This study provides valuable insights into the association between early-life experiences and adult optimism levels across national contexts.
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