Grumpy Old Men and Women? It's The American Workforce.

Younger and older worker's job satisfaction is trending in opposite directions ... and it's the most experienced workers who think work life is worse than it used to be.

A Pew Research Center survey says that while 9% more younger workers are "completely satisfied" with their job than in 1989, for workers age 50+, 13% less are as satisfied. The least satisfied group overall are those 30-49, with only 26% "completely satisfied." That's about the same as 1989's 24%.

18-29 year olds improved from 23% "completely satisfied" to 32%. 50+ workers dropped from 43% to 30%. That's a substantial drop.

The data suggests that a person's satisfaction with their work life is driven by one factor: whether they think job opportunities and job security are getting better or worse. And older workers say there is less security than there was twenty or thirty years ago.

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Only 12% of those age 50+ thought it very likely that they'd switch their career, and 66% said it was very likely they'd remain with their current employer the rest of their working life.