Many psychological and social processes that occur with a person are tied directly or indirectly to age. Strangely, this is not widely known. I even come across an attitude when I talk about this that some people at first perceive this fact as if I made it up! Which is very funny on the one hand and sad on the other. It’s sad, because the topic of age periodization and age-related crises is very important. Let me say first that this topic is not my findings or speculation, this is a statement from such a science as developmental psychology, which today is accepted throughout the world as a serious academic science. Moreover, people knew about age periodization or crises thousands of years before psychology appeared as a science in the world. So, even before our era, or more than 2000 years ago, people who were not psychologists could distinguish the period of childhood from the period of old age, for example. In our century, age periods have become more studied; they are now identified in greater numbers than before. There is not only childhood, but also adolescence, youth, maturity, and so on. Each period has sub-periods. This was well researched and described in the first half of the 20th century by Erik Erikson. Age periodization according to Erikson is the stages of formation that a person goes through from birth to death. He identified 8 stages, expanding the classical theory of psychoanalysis. There are his books in which the themes of age are shown very well. These are, for example, books published in Russia such as “Childhood and Society”, “Identity: Youth and Crisis” and others. There is a good book by D. Elkind, “Erik Erikson and the Eight Stages of Human Life.” The topic of age and its connection with the psyche is explored in “transactional analysis” by Eric Berne, who analyzed communication by breaking it down into “units of communication” or “transactions.” Hence the name of the method – transactional analysis. According to transactional analysis, three ego states can be distinguished in each of us: Parent, Adult and Child. The Parent ego state contains attitudes and behavior adopted from the outside, primarily from parents. Outwardly, they often express themselves as prejudiced, critical, and caring behaviors towards others. Internally, they are experienced as old parental instructions that continue to influence our inner Child. The ego state of an Adult does not depend on the age of the individual. It is focused on the perception of current reality and obtaining objective information. It is organized, well-adjusted, resourceful and operates by studying reality, assessing its capabilities and calmly calculating. The Child's ego state contains all the impulses that arise naturally in a child. It also contains a record of early childhood experiences, reactions and attitudes towards self and others. It is expressed as the “old” (archaic) behavior of childhood. The ego state of the Child is also responsible for the creative manifestations of the personality. I will also add that, of course, even without this knowledge, ordinary people in this world, even without studying psychology, easily distinguish the age period when a person is called a teenager (usually 12-16 years old), or a mature person. But this is a completely ordinary age division. For familiarization with the topic of developmental psychology, I could recommend the anthology, “Psychology of Age-Related Crises,” edited by A.E. Taras, published in 1999. It presents fairly modern views on this topic. For anyone who would like to supplement the information and more conveniently perceive it in a video rather than in printed characters, I can recommend an old video on the topic of this article, which is not so beautifully shot, but does not lose its relevance, “What needs to be done by the age of 40? What are the goals for 16, 23, 30, 37 years old? Link to this video on YouTube – In this video, some nuances of age are presented from the point of view of Maslow’s pyramid. Second video, “Transitional age in a child. What is important for a parent to do? This video is about one of!