Chapitre d'ouvrage: The participation of older workers in the labor market has increased in most high-income countries since the mid-1990s. This can be explained by changes in the characteristics of recent generations of older workers. The labor supply is healthier and better trained and includes more women. This can also be explained by reforms of retirement systems and of health and unemployment insurance systems, even if modifications may still be required to guarantee sustainability. In addition, recurring concerns about the productivity of older workers and their ability to adapt to technological change seem unfounded and likely to stem from prejudice against them. Finally, the promises associated with greater flexibility in working conditions have not, to date, led to a significant increase in the work of older individuals.