Researchers have found a “problem sign” that some people may be aging faster than others by observing the gait speed of individuals in their 40s. Doctors often use walking speed to measure overall health, so researchers expanded the concept in order to look at the mental and physical aging differences in adults. Slower speeds were correlated with older looking faces, smaller brains, and risk of dementia. This study further proves that lifestyle choices start taking their toll early on and recommend starting treatments if signs appear at this age. Low-calorie diets and intake of metformin are being investigated as ways to help slow aging.