Set in Moscow during the 1960s, 'I Am Twenty' tells the story of young individuals going through the struggle of coming-of-age in the Soviet Union. The film explores their experiences with exhibition and the impact of events like May Day on their lives.

After finishing school in their native village, Tolyasha (Igor Pushkarev) and Valya take exams to enter the pedagogical institute, but both fail. They return to their Green Shores. Valya works on a poultry farm and soon becomes a famous poultry farmer, and Tolyasha works as a driver. After a series of misunderstandings, their personal relationships improve...