A person with a life expectancy of 77.5 years who dies at age 20 has lost how many life years? What is the midpoint age if the age range is 25-30 years? If the total number of person years lived by the group who did not take the vaccine is 63,670.217, and the total number of person years lived by the group that took the vaccine is 63,678.458. What is the number of incremental life years? For individuals between the ages of35 to 44 years of age there were 24 deaths. These individuals had a life expectancy of 79.6 years. What is the midpoint age for your cohort?