People's aging is relative. In ancient times, 50 years old was very old. Now the concept of aging can be postponed, but it has been postponed. An 80-year-old person can have a 20-year-old blood vessel wall. It is a misunderstanding to think that people will lose their teeth when they get old. You don't have to give it up. It lies in reasonable exercise, scientific maintenance and prevention of long-term abuse. Humans have made new breakthroughs in stem cell research. There will be some clinical applications in the next ten years. At that time, aging could be delayed.