Senior Man Walking on Beach (IMAGE) Tufts University, Health Sciences Campus Caption New study identifies differences in gut microbiome composition in physically high-functioning vs low-functioning older adults, successfully transfers some of these effects into mice. Credit Pixabay Usage Restrictions Free for commercial use and requires no attribution: https://pixabay.com/photos/beach-senior-man-male-walking-2090091/ License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.