じゃくねんせいにんちしょう 若年性認知症 LinksSentence search for 若年性認知症Sentence search for じゃくねんせいにんちしょうKanji details for 若, 年, 性, 認, 知 and 症Edit in JMdict Noun1. early-onset dementia; presenile dementiaMedicine, See also 若年認知症 Discussions Log in to talk about this word.