Studies confirm an inverted U-shaped relationship between age and entrepreneurship. This paper deepens the understanding of this relationship by analysing how the relationship varies across time and across different types of regions, aspects often overlooked in the current literature. An individual perspective is taken, and the probability of starting a firm is expected to increase as individuals' age but at a decreasing rate. The results show significant differences in the relationship between the age of individuals and the rate of entrepreneurship across time and space. The age-entrepreneurship profile has shifted to the left over time such that individuals are younger when they start firms.