PurposeIt is important to understand why some workers prolong their working life even though they are entitled to statutory pension benefits. This paper aims to investigate whether senior workers are motivated by external factors such as pay and social expectations (extrinsic motivation) or are primarily motivated by internal factors such as job satisfaction (intrinsic motivation). This is a central question for policymakers and social partners when it comes to the design of public pension systems and work organisation.

Design/methodology/approachThis study uses a combined longitudinal administrative data and an own-designed postal survey to ask individuals aged 65–76 years to describe their work motivation. Based on the answers, this study constructs an index of autonomous motivation (AM) where a value of zero implies only extrinsic motivation and a value of one implies only intrinsic motivation. The values between zero and one thus imply various grades of AM, where higher values signal motivation that is more autonomous and hence a higher degree of intrinsic work motivation.

FindingsThe results of the statistical analysis show that the extent of intrinsic motivation is higher among senior workers who retired aged 65 years or older compared to those who retired at 65 years or younger. In addition, this study found that the degree of intrinsic work motivation among senior workers decreases when they face economic and financial constraints. It also found that intrinsic motivation is more prevalent among high-skilled workers.

Research limitations/implicationsThis study shows that individuals who continue to work after 65 are mostly motivated by the satisfaction they derive from their job. Job satisfaction is strongly related to skill level, job quality, job content and job autonomy. Results indicate that job quality and commitment to work are essential elements for motivating seniors to postpone retirement.

Originality/valueThis study contributes to this literature by applying a multidisciplinary approach from organisational psychology and labour economics that considers the potential importance of intrinsic motivation to work after standard retirement age. The authors think that this approach enhances the understanding of the mechanisms behind the lengthening of working life. Finally, this study suggests a simple, but efficient way of empirically measuring the extent of intrinsic motivation among workers.