Distributions of adult and childhood leukemia, CLL, and non-CLL as relative densities as a function of age at diagnosis in the entire population. We included the entire Danish population in a 28-year follow-up period from 1980 through 2007. Among 7 492 989 total persons, 20 062 people developed leukemia either as a child (n = 1228) or as an adult (n = 18 834). The age distribution shown here for leukemia patients is identical to the age distribution of controls in the nested studies.