若じゃく年ねん性せいアルツハイマーじゃくねんせいアルツハイマーじ字FuriganaMeanings1nounearly-onset Alzheimer's diseasemedicine›Medical term for Alzheimer's disease that develops before age 65. Often used in news and healthcare contexts.若じゃく年ねん性せいアルツハイマーは65歳さい未み満まんで発はっ症