Working Over 25 Hours Per Week After Age 40 Could Lead to a Decline in Cognition, Study Finds

A new study from the University of Melbourne finds that working the standard 40 hours per week could lead to a decline in cognition for people over the age of 40.

The study notes that while work can stimulate older workers' brains, long hours can "cause fatigue and physical and/or psychological stress, which potentially damage cognitive functioning." For those over 40, working over 25 hours per week could impair intelligence, while working up to that produced the opposite effect.