Meltdown 101: Changing work force, by the numbers

When Labor Day arrives Monday, it will be celebrated by a work force that has changed radically since the same holiday in 2008.

Over the past year, the labor market has suffered its most wrenching changes in a generation, shedding millions of jobs and changing the profile of the more than 131 million people who head to work every day.

American workers are older than they used to be, working fewer hours at cash-strapped companies and less likely to be unionized. And far more are now out looking for a job, and spending longer periods of time on the job hunt.

The rapid change has come on top of longer-term transformations. In 1959, nearly 30 percent …