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Using data from a longitudinal, high-risk sample (\n                    <jats:italic>N<\/jats:italic>\n                    = 1069) that assessed children and their parents regularly from early childhood (ages 3\u20135) through adulthood, multilevel growth factors of externalizing behaviors were used to predict adult outcomes (age 24\u201331), providing a sense of how externalizing problems across development were related to these outcomes via maternal, paternal, teacher, and child report. Findings indicated strong support for the lasting connections between youth externalizing problems with later educational attainment and legal difficulties, spanning informants and enduring beyond other meaningful contributors (i.e., child sex, cognitive ability, parental income and education, parental mental health and relationship quality). Some support was also found, although less consistently, linking externalizing problems and later alcohol use as well as romantic relationship quality. 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