PurposeOver the last decades, the development of entrepreneurial activity has allowed greater growth and economic development in Spain. However, within the analysis of Spanish entrepreneurial dynamics, insufficient attention has been paid to a key group: senior entrepreneurs. The fact that the first two decades of the 21st century have been accompanied by the two worst economic crises in remembrance since the Great Depression of the 1930s has had a great impact on the professional careers of the group of senior workers, whose careers have been cut short due to the closure of companies. In this way, the present work delves into the reality of senior entrepreneurs in Spain, analyzing the main characteristics of this group, which is becoming increasingly important in society.Design/methodology/approachUsing microdata from the Spanish National Statistics Institute's Labour Force Survey, the study focuses on reference persons who, being 50 years of age or over and actively working, work as an entrepreneur and have started their activity in the last 12 months. The study covers, in turn, the analysis period of the fourth quarters from 2005 to 2020. In relation to the methodology, the work focuses on the use of binary logistic regression techniques, given that the phenomenon to be studied is binary in nature: entrepreneurship or not.FindingsThe main conclusions drawn are the importance of sociodemographic factors such as educational level, age, the profession of the couple as well as the fact of having or not having children. The sector of activity and region are also significant. It is also concluded that senior entrepreneurship in Spain is of a necessary nature, considering the evolution of unemployment and decisions based on pension reform.Research limitations/implicationsThe main limitations of the study refer to the lack of socioeconomic information. Thus, it would be interesting to know the link among the sociodemographic characteristics and the economic situation of the professionals, as well as the fact of whether they have started from a previous situation of unemployment or employment.Practical implicationsThe obtained conclusions allow progress to be made in the generation of economic policies aimed at the professional reorientation of a group of workers who, due to labor market circumstances, are obliged to end long professional careers and to seek alternatives. In fact, entrepreneurship is a viable professional alternative for these professionals.Originality/valueDespite the importance of senior professionals in the Spanish economy, more research is needed on their characteristics and needs. Despite important studies such as Socci et al. (2020) or Perez-Encinas et al. (2021), there are not many studies for the Spanish reality. This paper seeks to deepen the understanding of the sociodemographic characteristics of Spanish senior entrepreneurs, based on current public information and considering different stages of the economic cycle.