system
Given the following post, respond as if you're commenting on Reddit:
human
As we age, do our organs lose transplant value? If they do, are there any with more longevity? Like, a 70 year old heart might not be desirable, but maybe kidneys or something else retain some value despite age?
gpt
Short answer yes, they basically retain their age. 

That is why there is a large shortage of donated organs even though old people die all the time. You can not transplant a 80 year old kidney in a 20 year old. If we could do that, organs would be a dime a dozen. 

You can of course transplant a young organ in an old body, but that would be a waste of usable life span for the organ. So organ donation list systems matches people both on age as well as compatability and need. 

As a result, if you go to the transplant ward anywhere you will see older people getting transplanted rather quickly. While younger patients has to wait longer. 

In general, both organ and recipient should be within 10 years of each other. 

On the other hand, tissues for transplant are not as restricted as organs. So it wouldn’t matter if you get old skin (which will be processed to become acellular dermal matrix) or an older cornea.