HIV diagnoses among 13- to 29-year-old men who have sex with men (MSM) have risen by 3 percent annually since 2008. The Centers for Disease Control and Prevention estimates that actual transmissions have declined 3 percent annually in 13- to 24-year-olds and increased 5.7 percent annually among 25- to 35-year-olds. Between 2008 and 2016, a total of 236,150 MSM were diagnosed with HIV; of these, 45 percent were ages 13 to 29, 43 percent were 30 to 49 and 12 percent were at least 50 years old. Blacks made up 49 percent, 28 percent and 25 percent of diagnoses in the youngest, middle and oldest age brackets, respectively. Of the 10 states with the highest proportion of MSM living with diagnosed HIV falling into the youngest age bracket, nine were in the South. Of the four major regions, the South saw the steepest increases in HIV diagnoses during the study period.