The reasons include positive ones like a quest for personal fulfillment. As longevity increases, people increasingly view work as one important way to keep their lives active and meaningful. "The very notion of 'retirement' – in that sense of uninterrupted leisure – is not nearly as popular among boomers" as among prior generations, says Neil Howe, a historian who tracks generational traits at LifeCourse Associates, a consulting firm in Great Falls, Va. "The idea of remaining contributors, and not wanting to simply be dependent consumers, is ... very important." In fact, some boomers may find that their most fulfilling career comes "post-retirement," as added wisdom blends with job descriptions that are higher on creativity or lower on stress.
The most obvious reason behind the world's graying workforce, though, has to do with pocketbook imperatives. Put simply, if people live longer, someone has to support them. Part of the answer, experts say, is that people of advancing years will play a bigger role in supporting themselves.
Governments are already feeling pressure to boost official ages of retirement, if they don't want to sink their economies under the weight of public debt. Riots in France before a parliamentary vote on the retirement age last fall may offer a foretaste of policy battles to come in the US and elsewhere. The world in general is on course for demographic aging on an unprecedented scale. Ultimately, the way it plays out is likely to have major implications for everything from living standards to the global balance of power among nations.