Biological life expectancy

When considering the average length of life we dealt with statistics and figures. Now consider biological life expectancy - this will be the consideration of the individual.
We have seen that the average life expectancy is the value of statistical, mathematical, it does not determine possible actual duration of life of every individual. As we have said, in all times and all peoples in every generation can find persons, life expectancy, which significantly exceeds the average life expectancy in this country. What is true is possible biological longevity, in other words, how much time he can live, if on the path of his life there will be no socio-economic and other obstacles?
First of all it should be noted that these barriers are set only on a massive scale, in relation to all individuals. Is it possible for these individuals to judge the possible duration of human existence? And if you can, what conditions contribute to this? Whether it is due to the particularly favourable for health food regime, the nature of work, no worries, abstinence from wine, tobacco, and other harmful substances?
To the first question is easy to answer. An indication of the expected duration of human existence is possible in life expectancy most older people who have just installed the year of birth and death. This is even the only way to judge. If the individual has reached 100-110 years or more, therefore, human life could, or, rather, could not take such a term. So, the question is why is very rarely live to that age.
Theoretically, to determine the biological limit to human life, we would have to put it in the experimental conditions, that is, in perfect conditions of existence, where he could live without any cares of life, without mental injury, to obtain the most appropriate, with modern scientific point of view, the power, poisoned poisons and much more. It is clear that such experience is to produce, we can not. In addition, not only the ideal conditions determine the duration of life.
In fact - and then we'll get to the second question,the number of individuals live to 90, 100 years or even longer if the conditions are not conducive to health. Take, for example, such full severe hardship and events of life, as the life of former revolutionaries people N. A. Morozov and Vera Nikolaevna Figner. They led the revolutionary struggle, was repeatedly arrested by the tsarist police, and in the end they were sentenced to death, commuted to life imprisonment. Each of them spent decades in Shlisselburg convict prison, in constant clashes with the prison authorities, without air, poor nutrition, with movement disabilities. Nevertheless, N. A. Morozov lived to be 92 years old, and Vera Figner - to 90 years, much higher than the average duration of life in our time, when people are immeasurably better conditions and more tranquil than they are.
Former Communards, the participants of the Paris commune, camelina and Lejeune were also the most complicated and difficult life that did not prevent them to live - the first 90, second to 96 years.
Survey ninety - hundredth of the people in our country showed that some of them life drank wine and smoked, ate meat, others didn't smoke, don't drink and sat on a vegetarian diet. Some have lived a relatively quiet life, others - life is hard and rough. What are the causes for their longevity?
Will investigate theoretically in these matters.
We know that warm-blooded animal species has a specific maximum life span and the limits of its range is relatively very small. So, the cat lives 9-10 years, the horse - 40 years, dog, depending on the breed,is 10-15 years, and so on, American scientist pearl (1928) gave this definition lifetime: lifetime of any living organism is determined by two factors: 1) genetically certain morphological and functional Constitution of the body, especially the average level of metabolism and the average level of energy consumption during the life; 2) environmental factors". But each of this species and individuals of these species these factors affect different. Genetic factors predict the maximum potential life span for each species. Environmental factors have a strong influence on longevity: when different unfavourable to the individual circumstances they can significantly reduce life expectancy.

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