若年認知症 じゃくねんにんちしょう Meanings Noun early-onset dementia; presenile dementia Kanji 若 young. Read as ジャク. 年 year. Read as ネン. 認 recognize. Read as ニン. 知 know 症 symptom. Read as ショウ. Word lists Medicine Jinuma: Japanese Dictionary · Word lists