Feeling the heat? It might be aging you faster than you think

If you've ever felt like the summer heat is draining your energy, you're not alone. But here's something you might not have considered: a recent study from the University of Southern California's Leonard Davis School of Gerontology suggests that extreme heat doesn't just make you feel older—it might actually accelerate your biological aging.

Researchers analyzed data from over 3,600 adults aged 56 and older across the U.S., examining blood samples over a six-year period. They focused on epigenetic changes—specifically DNA methylation patterns—that serve as markers for biological age. By comparing these patterns with local heat index data, they found a significant correlation: individuals living in areas with more days of extreme heat showed greater increases in biological age compared to those in cooler regions.

As we age, our bodies become less efficient at regulating temperature. Older adults often have diminished sweat responses and changes in skin that impair heat dissipation. Prolonged exposure to high temperatures can lead to cellular stress and inflammation, which may accelerate the aging process at a molecular level.

The study found that older adults living in hotter areas could experience biological aging up to 14 months faster than their counterparts in cooler climates. This accelerated aging is comparable to the effects of smoking or heavy alcohol consumption.

What can be done?
Let’s face it—stepping outside these days can feel like walking straight into a preheated oven. And with climate change turning up the dial, heatwaves are hitting harder, sticking around longer, and showing up more often than ever before. But while we can’t hit the pause button on the weather, there are things we can do to protect ourselves (and our sanity) during these scorching spells.

Seriously, don’t wait until you’re dying of thirst. Drink water regularly, even if you’re just chilling indoors. Our bodies lose a ton of fluids during heatwaves, and by the time you feel thirsty, dehydration may have already kicked in. So keep a bottle nearby and sip throughout the day. Bonus points if you add some lemon, cucumber, or mint for a refreshing twist.

If you’ve got air conditioning at home—amazing. If not, it’s time to get creative. Head to the mall, hit up the library, or check if your city has any cooling centers open. Even a couple of hours in a cooler environment can make a big difference. Pro tip: a fan and a bowl of ice water in front of it can work wonders in a pinch.

That midday sun is no joke. Try to plan workouts, errands, or dog walks early in the morning or after sunset when it’s cooler. And if you must go out during peak heat hours, wear light-colored, loose-fitting clothes and slap on that sunscreen. Shade is your friend—use it.

Older adults, young kids, and folks with medical conditions are especially vulnerable during heatwaves. Give your grandparents a call, check in on your neighbor, and make sure everyone has access to a fan, AC, or at least some cold drinks.

The truth is, extreme heat isn’t just uncomfortable—it can quietly wreak havoc on your body over time, especially if you’re constantly exposed. As climate change continues to fuel hotter summers, it's more important than ever to treat heatwaves like the health hazards they are.