When electoral turnout rates are low in general or unequal across social groups, it is harmful to descriptive representation and to the legitimacy of democratic government. Get-out-the-vote campaigns can increase turnout and target marginal voter groups to reduce participatory inequality. Crucially, inducing voting at one election contributes to the creation of a voting habit, which can yield persistent positive downstream effects. In this paper, we study the effects of two large-scale field experiments conducted on young Danish voters at the 2013 local election and 2014 European election on turnout in eight downstream elections between 2014 and 2024. Turnout is measured for virtually the entire population of potential voters with individual-level administrative turnout records. We find that the two campaigns increased turnout in the original upstream election. When we instrument turnout in the upstream election with randomly assigned treatment status, we find that the creation of a voting habit has persistent downstream turnout effects, particularly in elections of the same type as the upstream election (local or European) and in high-salience national elections. Finally, we show that the encouragement to turn out is particularly effective for low-propensity voters, which means that effective get-out-the-vote campaigns can foster more equal electoral participation years later.