The category of age determines the temporal characteristics of individual development. A distinction is made between chronological (passport) age and psychological age, which describes the degree of mental (psychological) maturity. In modern Russian psychology, the periodization of mental development is accepted: – infancy (0 – 1 year), leading activity – intimate personal communication;– early age (1 – 3 years), leading activity – object-manipulative;– preschool age (4 – 7 years), leading activity – play;– junior preschool age (7 – 10 years), leading activity – educational;– adolescence (10 – 15 years), leading activity – intimate personal communication with peers (according to D. I. Feldstein, – socially useful activities);– adolescence (the first period – high school age (15 – 17 years), the second period: 17 – 21 years), the leading activity – educational and professional;– mature age (the first period: 21 – 35 years, the second period: 35 – 60 years), the leading activity – professional and labor);– old age (60 – 75 years);– senile age (75 – 90 years);– centenarians (over 90 years)