A growing number of men who have sex with men aging with HIV (2021-2031): a comparison of two microsimulation models


 
 
 Men who have sex with men (MSM) on antiretroviral therapy (ART) are at risk for multimorbidity as life expectancy increases. Simulation models can project population sizes and age distributions to assist with health policy planning.
 
 
 
 We populated the CEPAC-US model with CDC data to project the HIV epidemic among MSM in the US. The PEARL model was predominantly informed by NA-ACCORD data (2009-2017). We compared projected population sizes and age distributions of MSM receiving ART (2021-2031) and investigated how parameters and assumptions affected results.
 
 
 
 We projected an aging and increasing population of MSM on ART: CEPAC-US: mean ± SD age, 48.6 ± 13.7y [2021] vs. 53.9 ± 15.0y [2031]; PEARL: 46.7 ± 13.2y vs. 49.2 ± 14.6y. We projected 548,800 MSM on ART (147,020 ≥ 65y) in 2031 (CEPAC-US) and 599,410 (113,400 ≥ 65y) (PEARL). Compared with PEARL, CEPAC-US projected a smaller population of MSM on ART by 2031 and a slower increase in population size, driven by higher estimates of disengagement in care and mortality.
 
 
 
 Findings from two structurally distinct microsimulation models suggest that the MSM population receiving ART in the US will increase and age over the next decade. Subgroup-specific data regarding engagement in care and mortality can improve projections and inform health care policy planning.
