Q: I’ve been reading about zombie cells and how, as we get older, they start to make us age faster and faster. How can I make sure they don’t ruin my health as I get older? — Dwayne R., Falls Church, Virginia

A: You packed a lot into that question. So, first let me say that having a RealAge of 40 at age 60 is absolutely achievable, and soon, being able to be 40 at age 90 will be more than 80% likely. The full scope of what it takes to do that (the science of self-engineering) is in my book “The Great Age Reboot.” But here, I can tackle your question about zombie cells.

Health pioneer Michael Roizen, M.D., is chief wellness officer emeritus at the Cleveland Clinic and author of four No. 1 New York Times bestsellers. His next book is “The Great Age Reboot: Cracking the Longevity Code for a Younger Tomorrow.” Do you have a topic Dr. Mike should cover in a future column? If so, please email questions@GreatAgeReboot.com.