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What age do people start getting out of shape?

According to Mount Sinai, most people begin to experience a gradual loss of lean muscle mass, or atrophy, after the age of 30. However, pinpointing an exact age when someone starts getting out of shape is complex, as it is heavily influenced by individual genetics, lifestyle, and exercise habits. The rate of decline is far from inevitable and can be significantly mitigated through proactive, healthy choices at any stage of life.