The Baltimore Longitudinal Study of Aging America's Longest-Running Study of Human Aging The National Institute on Aging’s Baltimore Longitudinal Study of Aging (BLSA) answers critical questions about what happens as people get older. BLSA Data Use Apply to use BLSA data in your research. Study Design and Measures BLSA researchers measure physical and cognitive changes over time. Join the BLSA! Learn how you can join the BLSA and make a difference in aging research. About the BLSA Read about the longest-running study of human aging. BLSA History The BLSA began in 1958. Read about its history and timeline. BLSA Research Advances Learn how the BLSA has furthered our understanding of human aging. Thank You to Current Participants A note of gratitude from BLSA researchers to current participants. What is Normal Aging? Lessons from the BLSA. BLSA Participant Newsletters Read the newsletters for research on BLSA research findings.