REVIEW YOUR MEDICATIONS
Painkillers, for example, can reduce awareness of the heat. Talk to your doctor about your medications if temperatures are climbing, especially if you're not protected by air conditioning. Older people are also more likely than younger folks to be taking medications that cause fluid loss (and therefore dehydration), including some laxatives, furosemide (Lasix) to counteract water retention, and other diuretics for blood pressure control.
CHECK UP ON A NEIGHBOR
Social isolation is a major risk factor for heat-related illness and death.
Thirst declines with age, and older sweat glands don't produce as much sweat as they used to. The sweat that is produced tends to contain more salt, and lack of salt in the body can lead to sudden drops in blood pressure.
LISTEN TO YOUR BODY
Muscle cramps, fatigue, weakness, impaired concentration, confusion, lightheadedness, nausea, labored breathing, chest discomfort, and a rapid or erratic pulse can all be signs of trouble. If you feel ill -- even just a little -- get to a cool place, drink plenty of cool water, and seek medical help if you don't improve promptly.