[Clinical issues of younger patients with dementia--Japan Psychogeriatric Society].

Younger patients with Alzheimer's disease (YPAD) present many clinical aspects different from people with late-onset Alzheimer's disease. The author reviewed terminological, diagnostic, and therapeutic issues, as well as support systems for YPAD and concerns related to disclosure. The Japanese Psychogeriatric Society is a leader in this field, focusing not only on treatment of AD, but also comprehensive support systems for people with dementia.