Sum the ages of all individuals in the study population. Divide the total by the number of individuals.
For example, if a study includes five individuals with ages 20, 30, 40, 50, and 60, the mean age is calculated as follows: Total age = 20 + 30 + 40 + 50 + 60 = 200 Number of individuals = 5 Mean age = 200 / 5 = 40
