A major heat wave is currently affecting the central and eastern United States, with temperatures soaring above 100 degrees Fahrenheit. The US National Weather Service predicts a hotter-than-usual summer nationwide. Unfortunately, extreme heat significantly increases the risk of dangerous heat illnesses, especially for older adults. Research shows that people over 60 account for most heat-related deaths in the U.S. The World Health Organization reports an 85% rise in heat-related deaths among people older than 65 between 2000 and 2021. This isn't a coincidence; the aging process and extreme heat simply don't mix well, experts say. Here’s why, and what older people can do to stay safe as temperatures soar. Why Heat Is More Risky As You Get Older Even if you're very healthy, getting older makes you more likely to get sick from the heat. This includes conditions like heat exhaustion, where your body struggles to cool down, or heat stroke, which can be life-threatening. As we age, our bodies naturally lose some of their ability to cool off. Experts explain that older people tend to hold onto more heat than younger people and have to work harder to keep their body temperature steady. Here are three main reasons for this change: Blood doesn't move as well When it's hot, your body tries to cool down by sending more blood to your skin and making blood vessels wider to help you sweat. According to a 2020 study published in the Journal of Physiology as you get older, changes in your heart and blood vessels make it harder for your body to move blood efficiently. This makes it tougher to control your temperature. You sweat less MedlinePlus explains that as you age, your body also sweats less, which is how it naturally cools down. This happens because your skin gets thinner, and the tiny tubes that carry sweat move closer to the surface. Plus, you lose a protein called collagen, which can squeeze these tubes, making it harder for sweat to get out. Easier to get dehydrated The feeling of being thirsty, and the urge to drink, gets weaker over time. Also, your kidneys become less good at keeping your fluids balanced. Studies show that kidney function can start to drop around age 40, meaning older adults are more likely to get dehydrated. On top of that, older people often take medicines, like water pills or sedatives, that can cause dehydration or make it harder to sweat. Signs to Watch For Heat illness often starts with a headache. Some people might also experience: Dry mouthDizzinessFeeling very tiredConfusionHeart flutteringTips To Avoid Overheating As Older Adults If you must go out on hot days, make sure you protect yourself from heat and avoid heat illness. Here are some tips according to the National Institute of Aging, Stay in air-conditioned places Older adults should try to stay in air-conditioned buildings as much as possible. Closing your blinds or curtains during the day can also stop your house from getting too hot. Find cooling shelters If you don't have AC, call your local health department to find nearby cooling centers. Fans can help, but sometimes they're not enough to beat the heat at home. Drink plenty of fluids Drink more water than usual to help keep your body cool and hydrated. Drinks with electrolytes, like sports drinks and vegetable or fruit juices, can replace minerals you lose when you sweat. Remember, if you feel thirsty, you're already dehydrated. Dress lightly and rest Wear loose, light, and light-colored clothes. Take cool showers or baths if you feel warm. Try not to do anything too strenuous, and get lots of rest until the heat passes.