The elderly will have old age odor is caused by multiple factors, mainly related to weakened digestive function and less cleaning times. 1, weakened digestive function: with age, the digestive system will degenerate, the elderly are prone to indigestion, resulting in gastrointestinal dampness and heat, resulting in bad breath and body odor. Family members should pay attention to the diet of the elderly, you can let the elderly eat more easily digestible food, or take drugs to help digestion under the guidance of a doctor; 2, less frequent cleaning: the elderly are slower, bathing, shampooing, changing clothes less frequently, long time without cleaning, it is easy to have an unpleasant smell. Some of the elderly are weak and afraid of cold, do not often open the windows to ventilate, resulting in indoor air is not fresh, will also produce a certain smell. Family members can often help the elderly bathing, changing clothes, indoor more open windows and ventilation, so that the air is fresh, can effectively reduce the odor.