When you are young, if you drink only when you are thirsty, you will probably get enough water. But by the time you are 60, if you drink only when you are thirsty, you will only get about 900f the fluids you need. The problem continues to get worse as you get older. So after age 50 or so, you need to drink fluids even when you are not thirsty. This is particularly important if you have retired to an area of the country that is warmer than you are used to, such as California, Florida, or the Southwest.
Dehydration can cause serious problems in older adults.
Even mild dehydration may cause constipation as well as other problems. Keep a glass of water to drink while you are watching TV or relaxing. Drink plenty of extra fluids after getting even mild exercise. Some diseases affect our fluid intake. Have your physician determine with you the amount of fluids you should drink each day.