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By C. E. Huggins NEW YORK (Reuters Health) - People with mentally challenging jobs, like air traffic controllers, doctors and financial analysts, tend to stay mentally sharper while on the job and following retirement, results of a new study suggest. "Working in a job that involves a lot of thinking, analyzing, problem solving, creativity, and other complex mental processing is related to higher levels of cognitive functioning not only before retirement (while we are still working) but after retirement as well," lead author Gwenith G. Fisher, of Colorado State University in Fort Collins, told Reuters Health in a email. This is not the first study to suggest a link between mental demands on the job and workers' mental function. Erten-Lyons, a neurologist at Oregon Health & Science University in Portland, was not involved in the new study.