With the aim of clarifying the question on the maximal life span of man 144 the long-lived persons of the Azerbeijan SSR aged 90 and over were studied. To determine chronological age different research method, documents confirming age (passports, registers in village Soviets, etc.) were used, wedding dated, date of birth of their children were studied, memories on remembering historic events, ect., were checked. As a result of the complex determination of age, it was established that in 24.3% of the cases the age of the long-lived persons had been exaggerated. The maximal chronological age of man has been established as being 121 years. This age has been reached in the Azerbaijan SSR by men and women alike.