More than half of the 1.25 million Americans infected by the human immune deficiency virus (HIV) are age 50 or older, Barbara Peters Smith reported in her award-winning piece. In just four years, that share should reach 70 percent. “As the longevity boom collides with a resurgence of HIV diagnoses nationwide, scientists are just now learning how this persistent, incurable virus ─ along with the powerful drugs that keep it at bay ─ takes a toll on the body that makes natural aging look like a gift,” she wrote. People with HIV experience age-related changes in their DNA more than 14 years sooner…