Ever looked at an old photo and wondered, "When did I start looking... different?" It rarely happens overnight. One day your favorite jeans fit differently, climbing stairs feels a little harder, or staying up until 2 AM suddenly seems impossible. It's easy to blame age, but what's actually happening inside your body is far more fascinating. Forget the popular myth that your body completely replaces itself every seven years. Science paints a much more interesting picture. Different parts of your body age at different speeds, and every decade brings its own quiet transformations. Some are barely noticeable at first, while others gradually shape how you feel, move, and even sleep. Here are five ways your body changes every ten years that most people don't realize are happening.
