Work refers to an activity involving mental or physical effort done to achieve a purpose or result. Promoting longer working careers is probably the most visible policy action concerning active aging. Currently, proportion of older people working for pay differs extensively between countries. The first studies focusing on changes in well-being around the retirement transition observed significant improvements, but more recently the changes have become less notable possibly due to improvements in the working life during the last decades. Nevertheless, significant policy changes are required to make it possible for people in high-risk profiles to extend their working years. Longitudinal studies show that negative exposures during working life track over to old ages.