Did you know that people 65 and older had approximately 40% of the heat-related deaths? One of the reasons is because the amount of water in a human body declines with age from approximately 80% of body mass to 60% when the 80-year old mark is reached. Also, with aging comes a less sensitive brain so the usual signals of thirst aren’t making it through. Symptoms of dehydration include headache, dizziness, and just plain feeling bad, but often the symptoms are not noted or are ignored. The bottom line is that older people do not sense temperature changes and are then victims of heat stroke and severe dehydration. So seniors, to be on the safe side, drink water in increasingly large amounts when the temperature soars.