Studies at the University of Padova in Italy and by France's research agency INSERM show higher risks of dementia from retiring early. The INSERM study shows that for every additional year worked we reduce the risk of dementia by 3.2 percent. Retiring at age 50 is considered very, very poor decision, and before 60 very poor decision, as cognitive development, mood, and active engagement with work offering complexity, all relate to good mental health. Countries like U.S. and Denmark where people tend to work for longer than in France and Austria are shown to be doing significantly better in cognitive performance in a 2010 study published in the Journal of Economic Perspectives. The Italian study shows the longer you spend in retirement the higher the risks of cognitive decline.