Little is known about the link between childhood and adolescent mental health (MH) difficulties and political outcomes in adulthood. This represents an important knowledge gap in understanding early individual-level factors for future political outcomes. Using the Growing up in Ireland cohort, following 8,568 children from nine to 20 years, we examine how different MH difficulties, and co-occurrence, are associated with various political outcomes. The results show childhood/adolescent MH difficulties are important predictors of political outcomes at age 20. Adolescents with chronic co-occurring MH difficulties starting in childhood report a lower interest in politics, lower trust in politicians, are less likely to register to vote, and if voting, are more likely to vote for an anti-establishment party. Adolescents with chronic emotional MH difficulties starting in childhood report a higher likelihood of voting for an anti-establishment party, but also show a higher probability of political activism and low external political efficacy.
