As the graying of the population progresses, Japan will see a rapid increase in the number of elderly people living alone or suffering from senile dementia. In the past, their relatives acted like their guardians. But the spread of nuclear families will make it difficult for relatives such as siblings and children to protect elderly people.

The welfare ministry predicts that the number of senile dementia sufferers who often get lost or who cannot properly do such things as shopping, money management, taking medicine and answering phones will increase from 2.08 million in fiscal 2010 to 3.23 million in fiscal 2025. The number of households consisting of a single elderly member (65 years old or older) is predicted to rise from 4.66 million to 6.73 million in the same period.

According to the Supreme Court, under the current guardian system introduced in April 2004, some 30,000 people applied with family courts for appointment as guardians of aged people in fiscal 2010. Besides relatives, professionals such as lawyers, judicial scriveners and licensed social welfare workers were appointed as guardians.