system
Given the following post, respond as if you're commenting on Reddit:
human
If you were to constantly replace ageing organs, could you extend your life expectancy?
gpt
You can't look at it like a car, where you can just replace the bad parts with new parts and keep it going.  Organ replacement in it's current state isn't that simple.  Once a person receives a transplant, they need to be placed on immunosuppressant drugs to prevent organ rejection.  They sometimes need to remain on them for the life of the organ.  These drugs have lots of side effects, including (as you might guess when you impair someone's immune function) increased infection risk among many other serious complications.  Infections are a leading cause of death among transplant patients. 

Now if medicine reaches a point where we're growing organs from your own stem cells, there could be a different story.