Mr. Holloway, who lives in a housing complex designed for the frail elderly, suffers from complex health problems usually associated with advanced age: chronic obstructive pulmonary disease, diabetes, kidney failure, a bleeding ulcer, severe depression, rectal cancer and the lingering effects of a broken hip.

Those illnesses, more severe than his 84-year-old father’s, are not what Mr. Holloway expected when lifesaving antiretroviral drugs became the standard of care in the mid-1990s.

The drugs gave Mr. Holloway back his future.

But at what cost?