Recently I have noticed that people who are able to maintain a healthy daily life despite the elderly,

"do not like alcohol and tobacco at all"

I told the story to my wife, she pointed out,

"My parents house and your parents house are typical counter-examples, aren't them ?"

Yes. She was right.

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As I mentioned before,

"A person who is able to maintain a healthy everyday life despite being an elderly person" is

still "a person who is able to maintain a healthy everyday life".

Finally, everyone finishes that state.

So, I think that the trend I should investigate is,

Period from "Healthy everyday life ends" to "Death"

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I have the hypothesis that "this period for early people, was sufficiently short compared to for present people, Because medical care was not well developed.

This hypothesis may already be thoroughly investigated and studied.

I'll look it up.