“…within a cohort of young men now 20 years of age, the total burden of HIV disease would be estimated to be 25.4% by the time that they reach the age of 30, 41.4% at age 40 and 54.0% at age 50…Among African American MSM the model predicts that 7.8% of African American MSM will be HIV positive by age 20, 38.7% at age 30 and 59.3% by age 40.”*

*“Running in Place: Implications of HIV Incidence Estimates among Urban Men Who Have Sex with Men in the United States and Other Industrialized Countries”
Ron Stall et al.
AIDS Behav. 2009 Aug; 13(4): 615–629.