Bones gain and lose mass throughout your lifetime, but they do not really shrink, rather they become less dense as we advance into old age. There could be some shrinking if the ends wore down significantly, but because bones are porous (they have tiny holes in them) the loss of bone mass usually comes from the inter honeycomb network of calcifications breaking down. We shrink in our old age only because the spine becomes curved and because we do not have the muscle strength to keep ourselves straightened out— so tendons and ligaments at joints become compressed.
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