Scientists identified a surprising subset of T helper cells that accumulate with age and help clear out damaging senescent cells. Credit: Shutterstock Prof. Alon Monsonego of Ben-Gurion University of the Negev found that T helper lymphocytes, which are immune cells involved in regulating the body's defenses, shift in function as people grow older. These shifts can reflect a person's biological age, which may not match their chronological age. Within these changes, the research team (the labs of