Your heart might be keeping a secret from you—and it’s not a good one. According to new research led by Northwestern Medicine and published in JAMA Cardiology, many American adults have hearts that are biologically older than the number on their driver's license.This isn't just a metaphor for feeling worn out or tired. It’s a real, measurable difference in cardiovascular health, and the implications are serious. Using a new “heart age” calculator based on American Heart Association data, researchers found that the average American’s heart is several years older than their actual age. For many, especially men, people of color, and those with lower income or education levels, the gap is even wider—sometimes by over a decade. So, how do you know how old your heart really is? More importantly, what can you do about it?What Is “Heart Age” and Why It Is Important?Heart age is a simplified way to express your cardiovascular risk. Traditional risk assessments—like the American Heart Association’s PREVENT equations—typically offer percentages: your doctor might say you have a 10% risk of a heart attack over the next 10 years. But these statistics can feel abstract and hard to act on.Dr. Sadiya Khan, professor of cardiovascular epidemiology at Northwestern University and senior author of the study, believes translating that risk into an “age” makes it more relatable. Telling someone their heart is 60 when they’re only 45? That hits differently.“The exciting thing about this tool is that there are a lot of things people can do,” Khan said in a statement. “The hope is that this empowers people to optimise their heart health for healthier aging and longer health spans.”Alarming Trends Across DemographicsThe researchers analyzed health data from over 14,000 U.S. adults aged 30 to 79 who had no prior history of cardiovascular disease. They used a publicly available, free online tool to assess heart age based on several inputs: blood pressure, cholesterol levels, smoking status, diabetes, medications, and more. The results weren’t pretty:Women had an average heart age of 55.4, despite having an average chronological age of just 51.3.Men fared even worse, with an average heart age of 56.7 versus an actual age of 49.7.The disparities grew starker across race, ethnicity, and socioeconomic lines:Black men had hearts that were, on average, 8.5 years older than their chronological age.Hispanic men followed closely at 7.9 years.Black women had heart ages 6.2 years older than their actual age.People with only a high school education or less were especially at risk, with nearly a third having hearts that were 10 years older than their birth certificates would suggest.“This helps to highlight the need for more urgent action,” Khan said. “Identifying individuals who have an ‘older’ heart age can help prompt action to prioritise prevention in at-risk individuals.”Why Your Heart Might Be Aging Faster Than You Are?It boils down to a few key lifestyle and health factors: high blood pressure, high cholesterol, smoking, lack of exercise, poor diet, and unmanaged diabetes.These factors quietly and persistently damage the cardiovascular system. Over time, this wear and tear increases your risk of heart attack, stroke, or heart failure—sometimes without obvious symptoms until it’s too late.Khan and her team hope the heart age calculator will help make this silent damage more visible—and more actionable.Can You Prevent Your Heart From Ageing?Even if your heart is older than it should be, that’s not the end of the story. Cardiovascular aging isn’t fixed. In many cases, it can be slowed—or even reversed—with the right interventions. According to the researchers, key lifestyle changes that can bring your heart age closer to your real age (or even make it younger) include:Quitting smokingImproving diet (less sodium, more fruits and vegetables)Increasing physical activity (at least 150 minutes of moderate aerobic activity per week)Managing high blood pressure and cholesterol with medications when neededMonitoring and treating diabetes effectivelyBut Dr Khan emphasizes that these actions aren’t just for those already diagnosed with heart disease. Younger adults, too, can benefit from understanding and addressing their heart age early—well before symptoms appear.A Simple Online Tool With Major PotentialThe free, public-facing heart age calculator developed by Khan’s team is already online and available to anyone. It takes just a few minutes and requires basic information like your age, sex, blood pressure, cholesterol levels, and smoking status.The idea is to encourage a shift from reactive to proactive care giving people a clearer sense of urgency before a heart event forces the issue.“We hope this tool helps doctors and patients discuss risk for heart disease more effectively,” said Khan. “The important thing is that we have very good options available in our toolbox to help slow that aging down if we can identify it.”Although this study focuses on the U.S., the implications are global. Heart disease remains the leading cause of death worldwide. A tool like this, paired with access to routine health screenings and education, could help people across countries and cultures make better decisions about their long-term health.In resource-limited settings where percentage-based risk assessments may not be widely understood, expressing risk through the lens of “heart age” could be a game-changer in preventive medicine.Your heart might be working harder and aging faster than you realize but the power to slow—or even reverse—that process is in your hands. This new heart age calculator doesn’t just offer a number.