According to Larry Kenney, exercise physiologist at Pennsylvania State University, “One of the unique things about humans is their ability to increase blood flow to the skin. When we’re hot we pump a lot of blood to the skin and the vessels dilate, — that’s why the skin looks red when it’s hot outside.”
For many years, researchers at Penn State have studied how aging affects how we regulate our temperature. At first they focused on sweating.
“Originally we thought, as a lot of people thought, that older people were less able to tolerate heat because something happened to the sweat glands in their skin. They just produced less sweat as the skin aged, sweat glands atrophied or went away. It turns out that’s not the case. In fact, sweating is a lot more related to how fit you are, how acclimated to the heat you are and how well hydrated you are than it is to age. But what does change with aging is blood flow to the skin,” said Kenney.
Read more at Inside Science