Helping others is linked to a younger brain

To examine how participating in support for others affects brain health, researchers used data from the large‑scale Midlife in the United States (MIDUS) project, which collected information about the health and well‑being of thousands of adult Americans. The focus was on a metric called BrainAGE — a special biomarker that reflects the difference between the “brain age” estimated from scans and a person’s actual age.

BrainAGE was calculated using a machine learning algorithm: it was trained to predict chronological age based on structural MRI scans. Then, these estimates were compared with how much time the participants spent providing instrumental (concrete, practical) and emotional support to other people. For the analysis, multilevel regression, bootstrap methods, and data‑based variable selection were used — this made it possible to reliably identify the relationship between behavior and the BrainAGE indicator.

The more hours per month a person reported spending helping others, the lower their BrainAGE turned out to be, meaning the brain looked younger. Moreover, this relationship persisted even after taking into account many other factors: demographic characteristics, health status, lifestyle, social circumstances, and even the support the person themselves received from those around them. Furthermore, it was the hourly measure of assistance that provided additional explanatory power compared to more general statuses such as “caregiver” or “grandparent.”

The study does not prove that helping others directly slows down brain aging or prevents diseases. It merely shows a statistical association and highlights everyday prosocial behavior as a possible neuroprotective pathway in middle and late adulthood.

From a practical standpoint, this may be important for healthy aging programs. If the results are confirmed in other groups of people, they could form the basis for new approaches, for example, in interventions that encourage prosocial activity in adults, or in specially organized activity formats for the elderly, where helping others becomes part of the daily routine.

At the same time, it is noted that further research should clarify which mechanisms may underlie this relationship: whether the assistance affects stress levels, social engagement, a sense of significance, or triggers certain neurobiological processes.