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All things being equal, probably so.The problem is that all things are rarely equal. Ears, like noses, continue to grow throughout life, so older people will tend to have bigger ears (even as a proportion to their overall size - particularly as the head grows less than many other parts of the body) than younger people; and thus the bigger ears merely compensate for otherwise deteriorating hearing.Another factor must be the shape, as well as the size, of the ears. If the ears are to better focus the sound, then they should be sticking out rather than lying flat against the skull. Of course, even if the ears do better focus sound from the front, this must be at the expense of reducing the amount of sound heard from other directions.
Humans tend to also accumulate ear hairs as they grow older. Could this be an adaptation to channel or 'absorb' more sound waves as well as bigger ears?
People with bigger ears may be receiving more "sound", but that does not mean they hear better.I don't remember (or find back) if it was on this forum or on an other one, we had a discussion about silence. The conclusion was that in a silent environment, our brain simply increases the sensitivity of our hearing and we end up hearing our own blood flowing.So I take it that if we increase the size of our ears, the brain will end up by reducing the sensitivity.