Your body is one big clump of cells. Its constantly replicating these cells but every time it does it there’s minor changes. Imagine a xerox machine. You start with the original copy and make a copy and take that copy and make a copy and then that copy and make a copy etc etc. Everytime you make a copy the quality of the image gets worse and worse. This is aging.
So, accumulatively, over the years you entire body just breaks down and gets weaker. Your genetics and lifestyle can make certain parts break down faster or worse.
Our bones and joints get fragile and weak. Our hearing and eyesight can start to go. Your organs can get poor at doing their job. Your brain can even just start breaking down. All of these things can trigger various series of events that can kill you.
Nobody just stops breathing from old age. They just get really fragile and a simple illness or injury can steamroll series of events that their body is just too weak to bounce back from and they die from that.
As a nurse I see a lot of UTIs, dementia, pneumonia and hip fractures in the super elderly.
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