Unlike other organs, like your liver or skin, your ear doesn’t regenerate . Those tiny hairs on the nerve cells that pick up all the different frequencies before sending them to your brain degrade over time. The hairs tuned to high frequencies are physically located closer to the ear opening and so experience more stress and are the first to go. The older you are, the more sound your ear has experienced and the harder it is to distinguish high pitches. (Youtube’s compression algorithm messes up the 19,000 HZ signal, and make sure you use headphones rather than ear buds.)
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