American scientists from the Meyo Clinic Medical Center in Rochester have discovered a simple and effective test to assess the extent of human aging. The study was published in the scientific journal PLOS One. The team conducted a series of tests involving 40 healthy people over the age of 50. The tests included walking, balance ability, grip strength and knee strength. In the balance tests, participants stood on force platforms in different positions: on both feet with eyes open, on both feet with eyes closed, on the dominant (the one we are used to taking the first step) foot with eyes open, and on the non-dominant foot with eyes open. Each approach lasted 30 seconds. The results showed that the most accurate indication of declining physical ability with age was indicated by how long a person could stand on one leg, especially if the leg was non-dominant. “Balance is an important indicator because, in addition to muscular strength, it requires the involvement of vision, the vestibular system and the somatosensory system,” said the study's senior author, Dr. Kenton Kaufman. According to the scientist, people can start practicing balance training to delay age-related changes. This involves standing on one foot for 30 seconds a day with a foot change. It doesn't take much time and doesn't require special equipment.