For one thing, we actually lose some sweat glands as we age, and we have less body water. ???The other thing is that we have less body water percentage,??? she said. ???At age 80 we only have about 45 to 50 percent in men, and about 40 to 45 percent in women.??? Combine that with health concerns such as high blood pressure or other heart conditions, and it???s easy to see how older people can get