This paper deals with the study of older workers’ job satisfaction as a factor that, combined with other personal and job-related factors, can significantly influence the decision to postpone retirement when this decision is in the hands of an individual. Starting from the fact that the employment rate of older workers in Slovenia in 2011 was the lowest in the EU, the paper aims to establish the level of older workers’ job satisfaction in Slovenia compared to the EU, analyse its dimensions, its specifics related to age, gender, sector of economic activities and type of profession, as well as ascertain what determines it the most. A statistical analysis of the results of the Fifth European Working Conditions Survey of 2010 reveals that Slovenia ranks 15th among the EU member states in terms of older workers’ job satisfaction, thus lagging behind the EU average. While Slovenian older workers, the same as their European counterparts, are most satisfied with doing useful work and the least with their prospects for career advancement, a comparison with other EU member states shows that they are relatively dissatisfied with working conditions, salary and adequacy of the motivation to give one’s best performance, and relatively satisfied with doing useful work and with their colleagues. The analysis also shows that the level of older workers’ job satisfaction in Slovenia is determined most by their satisfaction with the adequacy of the motivation to give one’s best performance.