Walking slow could be a sign of faster ageing. Researchers from King's College London and Duke University have found that our speed of walking can help predict the risk of diseases like dementia. The research showed that the bodies and brains of slow walkers tend to age more by the time people are 45 as compared to those who walk fast. The findings have been described as an 'amazing surprise'. Gait speed is an interesting indicator of lung function, eye sight and muscle strength, according to the researchers.