The purpose of this study was to explore participation in job-related lifelong learning (LLL) among high-educated mature workers and compare it across four Nordic countries.While this group generally is very active in LLL, the centrality of knowledge work in society, rapid pace of skills-renewal, and due rising learning demands on all qualifications levels, necessitates a better understanding of the patterns of and factors affecting their skills development. The paper builds on theories learning motivation, human capital, and workplace learning. Data from the Survey of Adult Skills (PIAAC) by the OECD was used.Besides high participation rates, systematic level differences in participation were found across the countries. The logit regression analyses revealed clear differences between countries in the models explaining participation, suggesting limited support to a single "Nordic model" of LLL. Furthermore, predictors of participation commonly found among adult population, low-educated, and/or younger adults, appeared less valid among higheducated.