The unprecedented rise in life expectancy has made advances in the understanding of biological hallmarks of aging, at both the molecular and cellular levels, essential. A joint effort between Baylor College of Medicine, Genentech Inc., Stanford University and collaborating institutions has led to the release of the first Aging Fly Cell Atlas (AFCA) as a result of a deep dive analysis of 163 different cell types in Drosophila melanogaster, the common fruit fly.