At present, people are 70 years old, and every 100 years, they lose 1 year. When they reach 10, they will lose 60 years old. Every 100 year, if one year is missing, it will be 6000 years.
Then it rises from 10 to 84000, and then falls from 84000 to 10, which is a cycle.
The total length of age change in this period is (84000-10) × 2 =167980 years old. Then × 100 = 16798000.
That is to say, from 10 to 80000, and then down to 10, this cycle is: 16798000.
The change time from 10 years old is: 567000000 -6000 =5669994000.
56699000 ÷16798000 = 337.539, indicating that there are 337 cycles 10 years in this period.
The time of these 337 cycles is 337* 16798000=5660926000.
5669994000 -5660926000 =9068000.
That is to say, from now on, human life span is 5.67 billion years = from 65438 +00 years, after 9068000 years.
The period from 10 to 10 is 16798000, so the period from 10 to 84000 is half a period =8399000.
9068000 -8399000 =669000.
In other words, at that time, the life span of human beings began with the life span of 84,000 years, and after 669,000 years, the life span of human beings.
669000- 100 = 6690 years old.
At that time, the life span of human beings was: 84000-6690 years old = 773 10 years old.