Do LL patients lose the same amount of height as they age ?

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I am now in my twenties. I am 1m68 and i would like to increase my height by 7cm or 8cm to 1m75-76. I feel that 7 cm is safer and i am not too comfortable with the idea of going all the way to 8cm. However, i know that humans naturally lose height as they grow old (typically 1 cm every 10 years after age 40). that means that i will slowly go back to being short as i become an old man. My question is : Does anybody know if we lose on average 1 cm every 10 years like most people or we would lose even more height because we got it via surgery ? Thank you !

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Oh if the height loss is related to spine compressing, does that mean that we can avoid losing height by stretching and doing yoga regularly as we age ? I'll have to look it up