The data note presents and discusses descriptive statistics comparing key variables on individuals’ social origin, cognitive ability and educational attainment that have been constructed based on the information contained in four different data sets: National Child Development Study (NCDS), 1970 British Cohort Study (BCS70), Longitudinal Study of Young People in England (LSYPE) and Avon Study of Parents and Children (ALSPAC). The main sets of variables presented are (1) measures of respondents’ cognitive ability in childhood, (2) parental education, class, status and income, and (3) respondents’ highest qualification and measures indicating whether respondents have crossed different educational qualification thresholds.