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This longitudinal study, tracking 300 couples from the 1930s through 1980, identifies personality as a primary driver of long-term marital success. The most significant predictors of both dissatisfaction and divorce were the neuroticism of both spouses and the husband’s impulse control. While social environment and sexual history contributed to the outcomes, these baseline personality traits, measured as early as the engagement period, remained the most robust indicators of whether a marriage would endure or thrive over five decades.