Why doesn’t the “smell” ever wear off the coins?
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The smell isn’t off the coins, it’s off the oil from your hands. Your oils come in contact with the metal, which breaks them down into compounds that you recognise as “metallic smelling”.
The age of the coins doesn’t really matter, as they’ll always be made of the same metal from the moment they are minted to the point they are melted down again (or otherwise get destroyed). Your hands will always have skin oil on them, even just a tiny bit, so if you touch pennies odds are they’ll start smelling metallic
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