Can human life expectancy be calculated? What do scientists think?

Of course not. First of all, each person's lifespan has a certain relationship with genes. Secondly, it is also affected by the living environment, as well as some sudden circumstances. Under such complex conditions, the results cannot be obtained by calculation alone.

All living things in the world will usher in death, and how to die is something that no living creature can **, but many people will want to know when they will leave this world, so that they can prepare trivial things in advance.

Since the time of the ancient Qi Yuan Dynasty, people have been very persistent in the pursuit of immortality, and many people in history have not been gods and often like to eat the "elixir of life". Of course, there are also people who die of poisoning because of this. Nowadays, with the development of society, the continuous progress of medical standards, and the improvement of living standards, the life expectancy of human beings has also been greatly extended.

So how many years is the limit of human life?

We all know that the human body is from the weak of the young to the strong of the youth and then to the weak of the old, this is an unavoidable law, in this process the human DNA gene continues to suffer different degrees of loss, the chromosomes are also weakened, followed by the decline of various functions of the human body, the first changes seen by the naked eye, the hair becomes white, the eyes have also undergone subtle changes, the body's immunity has also changed, the disease attacks the human body, and finally dies.

With people's lives getting better, there are now a lot of centenarians, but scientists speculate that the limit life span of human beings will not exceed 140 years old, normal people, if there is no major loss in life, and the immunity is normal, then his life expectancy is no problem more than 100, but now the rhythm of human life and eating habits, so that the human body is more or less affected by some diseases.

However, there are many diseases that are not worth mentioning in their eyes, but can the young body endure it, and the aging body can withstand it? With the increasing number of medical equipment and body maintenance, the aging of the human body is gradually slowing down. As the average life expectancy of the global population has increased and the aging population has intensified, the age stages have been reclassified to define young people up to the age of 44.

45-59 years old are the middle and blind people, 60-74 years old are young and old, 75-89 years old are real old people, 90 years old and above are long-lived old people, and 100 years old and above are centenarians. According to this regulation, it can be seen that the middle age period is obviously regressed. However, it is believed that in the near future, human beings will live longer and longer, but this extension of age will increase the burden on the earth, but there may be a better way to solve this problem in the future.

What do you think about this?

2. If it is described in words, the method of calculating the average life expectancy of the population is: to conduct a follow-up survey of a group of people born at the same time, record the number of deaths in each age group until the end of the life of the last person, and then calculate the average life expectancy of the population according to the number of people who live to various ages in this group of people. Using the average life expectancy of this group of people to assume the average life expectancy of a generation, the average life expectancy is the average life expectancy.

3. In fact, it is very difficult to track the entire and complete life process of a group of people born at the same time, in the actual calculation, it is often possible to use the mortality level of the population of each age in the same year to replace the mortality rate of the same generation at different ages, and then calculate the average survival number of the population of each age, so as to calculate the average life expectancy of the population in this year. Thus, the average life expectancy of the population is related to the level of mortality at the same time.