Doing this for just two hours a week could slow brain aging by up to 20%
Researchers analyzed 20 years of data from more than 30,000 US adults in the Health and Retirement Study, comparing people who volunteered or regularly helped neighbors, relatives or friends against those who didn’t. The helpers showed 15 to 20 percent less cognitive decline linked with aging, and the benefit peaked among people giving two to four hours a week. Beyond that, the benefit didn’t keep increasing at the same rate.
Sae Hwang Han, the study’s lead author, names social connection and a sense of purpose as the mechanism, and adds that helping others may cut stress and inflammation, both linked to cognitive decline on their own. Neuroscientist Faye Begeti flags retirement as the point where she most often sees people scale back mental challenge, and recommends volunteering specifically as a way to stay cognitively active after leaving work.
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- The study appears in Social Science & Medicine; Han is at UT Austin’s Department of Human Development and Family Sciences, Begeti at Oxford University Hospitals.
- In-person help is framed as the strongest version of the effect, though remote or virtual volunteering still counts if it’s cognitively stimulating or builds real connection.
- Informal help worked just as well as formal volunteering. The study didn’t require signing up for an official program.
- Han’s framing for the takeaway: helping others is good for the community and, separately, measurably good for the helper’s brain.