The study points to a correlation between entering your 30s and having young children at home, thereby wanting to balance work with home life and not having enough time to master both. The study also found that promotion opportunities seem to plateau for workers in this age range.
But the slump won't last forever. Psychologists say that workers in their 40s and 50s are more satisfied with their jobs than any other age group.
For more information on how employee happiness affects business, see our [blog post].