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Hm... interesting points, but think of it this way:
The average human lifespan keeps expanding. Living till 70 was unheard of nearly 100 years ago, just like living to 50 was unheard of just 100 years before that. Now it's pretty common that you see 70-80 year olds with 100 being the "wow" age.
I think it's all based on the cells surrounding environments.. disease, nutrition, etc. I mean, it wasn't until farily recently that exercise (particularly cardio) was recommended as part of a healthy lifestyle.
Based on that, it's my opinion that cells have an indefinite lifespan, but it's just how they're treated that determines when your body as a whole kicks out. Of course, there are exceptions and abnormalities like cancer.
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I love lamp.
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