The race to measure aging—and why it matters

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January 26, 2026 The race to measure aging—and why it matters By Dominique Mosbergen Correspondent How old are you, really? Companies, researchers, and even the U.S. government are racing to develop more accurate and reliable ways to measure so-called biological age—the age and function of your body's cells, tissues, and organs. But why does anyone care about measuring biological age? Scientists say that developing real longevity drugs and other interventions just won't be possible without them. READ MORE » If you have a minute, please take our quick survey to help us better understand who you are and which health topics interest you most. Take the Survey WHAT ELSE TO READ How to Get Healthier Dopamine Highs Dopamine has a dark side. Substances that give us great pleasure, from coffee to cocaine, can raise dopamine levels too high. We explain how to get healthier dopamine highs.   7 Things to Say When Someone Gaslights You We asked experts what to say, and why it works.   The Health Benefits of Wearing Shoes in the House People who work from home are increasingly reporting foot pain. Often, it's because they're walking around barefoot.   If you were forwarded this and want to sign up to receive it daily, click here. Today's newsletter was written by Dominique Mosbergen and edited by Angela Haupt.   Want more from TIME? Sign up for our other newsletters.         Subscribe to TIME TIME may receive compensation for some links to products and services in this email. Offers may be subject to change without notice. Connect with TIME via Facebook | Twitter | Newsletters PRIVACY POLICY | YOUR CALIFORNIA PRIVACY RIGHTS Questions? Contact newsletters@time.com Update your email preferences or unsubscribe here © 2026 TIME USA, LLC. All rights reserved. TIME Customer Service, P.O. Box 37508 Boone, IA 50037-0508, United States of America Terms of Service