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Everyone how to find the age of a tree. We count the number of rings on the tree's stump. A scientist has a new way to measure the age of people – get them to on one leg. Dr Kenton Kaufman from the Mayo Clinic in the USA said on one leg shows how well a person can balance. He said balance more difficult as we age. Dr Kaufman added: "Balance is an important measure because, in addition to muscle strength, it input from vision, the [hearing] system, and the [senses]." He : "Good balance the ability to carry out activities of daily living without the fear of falling, and this to improved quality of life and healthy ageing."

Forty people over the age of 50 part in the research. They tests for walking, balance, grip, and knee strength. Each participant had to on their dominant and non-dominant leg for 30 seconds. They this with their eyes closed, and again with their eyes open. Kaufman that standing on the non-dominant leg showed the highest rate of decline with age. There was a 2.2-second-per-decade decline when participants on their non-dominant leg. This to 1.7 seconds for the dominant leg. Kaufman concluded: "Standing on one leg a good measure of your overall health because balance how the body's systems working together."