What happens to a person in mature, old and senile age?

Mature age (22–60 years) is a period of physical and creative active working capacity of a person, the reproductive function is carried out. After 60 years, there is a slowdown in metabolism, a decrease in the performance of all organ systems, an aging of the body; body weight and length decrease, organ atrophy occurs.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.