system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If dying of old age is not an actual cause of death then could one live indefinitely(not immortal) provided they have enough money and a constant supply of vital body parts to replace with?

I am going to preface this by defining an indefinite life span as being able to avoid all complications that come with age that typically lead to death but one remains vulnerable to physical injury,disease deliberate acts of murder therefore not immortal but at least in theory can live eternally provided they avoid causing all physical harm that can lead to death.

Now hypothetically speaking If one was a billionaire for example I can't see why they could not afford to have a doctor on retainer living on the premises,nurses,hospital grade equipment in house,etc in order to meet all their medical needs on a daily basis,monitor changes and respond immediately to minimize health problems and risk of death.

The only thing I see that might be a challenge is replacing failed/diseased body parts like kidneys,other organs,and what not since there is a global shortage of organs and other vital parts. To my knowledge these parts are also mostly donated to hospitals for use at their own discretion with long waiting list and not for commercial sale which creates another obstacle in attaining an indefinite life span.

However if one could somehow obtain a constant supply of hearts,kidneys,etc(maybe from relatively healthy suicide victims or perhaps artificially grown parts from stem cells) as ghoulish as it sounds could said individual possibly live indefinitely? Is there any purely medical reason why death would be inevitable at some point assuming all variables remain constant and all procedures go according to plan?
gpt
No, you couldn't, and the reason is your DNA. Your DNA has bits of blank information on the end of it that are called telomeres. They act as a buffer to prevent damage to your DNA, because every time your cells reproduce, there is a risk of losing a very small amount of data from the resulting DNA. Think of them like aglets on your shoelaces. The telomeres are there to absorb the damage, leaving the important data in the strands of DNA intact. This can't happen indefinitely, however, because eventually the telomeres will wear away. This is what causes aging. Once the telomeres wear away, any damage that happens to the DNA strands happens to actual, vital data, causing the body to slowly function less and less efficiently, until eventually it simply cannot operate well enough to function anymore.