Some caregivers do not live with their elders, and even if they do, they go out early and come home late, making it difficult to detect any deterioration in the elders' cognitive ability. Caregivers may think that there is no obvious problem because they see their elders at home in the morning and at night. In fact, they may not be aware of how the elderly live during the whole period of time and whether they have to face any difficulties due to cognitive deterioration. For example, some elders may need more and more time to recognize the way when they go out, or they may need the assistance of security guards or passers-by on the way home. If the elders or other people do not inform the caregivers of the situation, they may not be aware of the deterioration of the elders' cognitive ability, and thus overestimate the ability of the elders.
