The average human heart bea 365/24/7 for 3 billion+ times in a normal human life of 78.5 years - what human technology has invented to rival such a machine? In my case of 91.5 years, the count is.3.5 billion +

A health body at 91 year of age due to good genes may still function in a healthy way but have more delicate balance of living condition and less room of error and adjustments- Hence, 

• don't get laid up in bed, 

• don't fall

• small illness may amplifies into major system breakdown 

I had a "mild" case of flu recently and it still recovering. But here are the after effects that I won't feel if I was ten or twenty years younger. It is muscle ache all over my body. During physical exercise routines, I use to be able to get up from a chair without uusing arms or arms rest for 5 times in 20 seconds. Now I can no longert do it without help. I can also used to walk a short diatance without a cane or walking support with no faer of losing my balance. But I am now still recovering with muscle pain in my legs and do not feel safe walking un-aided.. Hopefully these condition may not become permanent.