Ideations and intentions are important precursors of actual behaviour but are still understudied in the literature on the transition to adulthood. This article provides a descriptive overview of ideations and intentions about the timing of four key events in the transition to adulthood – exit from the parental home, cohabitation, marriage, and parenthood – using cross-national representative data for 33 European countries from the Generations and Gender Survey and European Social Survey. Results show that ideations and intentions about the transition to adulthood are, like behaviours, gendered and display distinctive country differences. The analysis of age-graded ideations and intentions suggests a mismatch between the ideal and actual ages at which key events occur during the transition to adulthood. Young people aged 18 to 34 in Europe consider it ideal to start a non-marital cohabitation, marry, and become parents during their 20s but, on average, experience these events later than their ideal timeline. This mismatch is particularly pronounced among men and for the events of marriage and parenthood.