Alina Pelikh (University College London), Júlia Mikolai (University of St Andrews) and Hill Kulu (University of St Andrews) use data from BHPS and UKHLS to study how first partnership transitions have changed across three birth cohorts: 1974-1979, 1980-1984 and 1985-1990, who were observed between 1991 and 2016 and were aged between 16 and 27.