A new study finds many employees are considering leaving their organization even though they’re very satisfied with their job, their salary and benefits package, and they think there’s room to grow in their company.

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The survey, conducted by the global consulting firm Mercer, finds 37 percent of workers are looking to leave, up from 33 percent just four years ago. Of that group, 45 percent say they enjoy their job and they’re happy with the amount of money they’re earning.

"This is truly a new paradox, when we think about the employee value proposition and how organizations need to think about and consider new strategies for employee retention and growth," said Mary Tinebra, Mercer Northeast market leader.

She said the data suggests a new kind of employee mindset.

"There are different expectations from the employment relationship than we might have thought of years ago, and particularly if you look at Gen X and Y and that work group," Tinebra said.

The survey finds 44 percent of workers ages 18 to 34 are seriously considering leaving their jobs, compared to 29 percent of workers in the 50-to-64-year-old age group.

Tinebra said in many cases, millennials are looking for different opportunities "which might be going to a startup organization, or something which would fulfill a different need for an individual employee."

Or they may also just get bored.

"They want things quickly," she said. "They want to experience things in a much faster track, and for many of these millennials, there’s an opportunity for them to navigate left and right in a career that may be different from the initial role that they came in -- and what I would say is they declare a 'major' a little bit later in life."

She stresses these workers are reshaping the business value that’s been there for years.

"This means companies need to look at having an age diversity in their workforce in a different way," Tinebra said. "Do a diagnostic and consider how to hold on to younger workers, especially."