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