What are the five stages of a person's life cycle?

Infants and adolescents, adolescents, youth, middle age, old age.

The connotation of life refers to a kind of phenomena that naturally appear in the process of the development and change of the universe, such as self-growth, reproduction, feeling, consciousness, will, evolution and interaction. In addition, it can also include self-replicating amino acid structures produced by biochemical reactions, as well as fungi, bacteria, plants and animals. As far as the future development possibility is concerned, the machines manufactured or upgraded by people are complicated to a certain extent, and the phenomena with some basic attributes that conform to the connotation of life will also be included.