Overestimation of the elderly's ability is one of the causes of loss. Some caregivers do not live with their elders, and even if they do, they may have to go to work and return home early in the morning and late in the evening, leaving their elders alone at home most of the time during the day, and may not be able to detect any deterioration in the cognitive ability of their elders. Caregivers may think that there is no obvious problem when they leave home for work in the morning and come back home in the evening and see their elders at home as well. In fact, they may not know clearly how the elderly live during the whole period of time and whether they have to face any difficulties due to the deterioration of their cognitive ability. For example, some elders may be losing their ability to recognize the way home after going out to the market for shopping, which normally takes them 15 minutes, but now it may take them 30 minutes or even an hour longer to recognize the way, or they may need the assistance of passers-by or security guards before they can return home safely. If the elderly or others do not tell the caregiver about the above, they are not aware of the deteriorating cognitive ability of the elderly and thus overestimate the ability of the elderly.
