In almost all countries, women more often change working time than men, and women are also more likely to move in and out of the labour force. Age patterns of labour mobility are different for men and women and can partly explain the gender wage gap as women i) have more stable careers when they are young, ii) more often change their professional situation at prime age (driven by moves in and out of the labour force), and iii) less often go through a professional change when above 55 years old. The missing labour transitions (change of job, employer or contract type) at the early stages in their career significantly shape women’s careers: job chum at this crucial time in one’s career has the highest effect on wage growth and helps in finding the right job.