Demand estimation of medical, health care and social welfare facilities for the aged in 2000 was carried out through the Cohort method in Muroran, Noboribetsu and Date. Those were compared with demand of facilities in "Health Care and Welfare Plan for the Aged" of each city. Some kinds of facilities in Muroran and Noboribetsu aren't enough because trend type of estimation wasn't suitable. But those facilities in Date are enough because of its ahead of the aged policy "Prime Healthy Town Plan" and its implementation and its stabler change of population than Muroran and Noboribetsu.