若じゃく年ねん性せい認にん知ち症しょうMeaningsNoun1. early-onset dementia; presenile dementiaKanji used若young年year性nature (of a person)認admit知know症medical conditionComposed of若じゃく年ねんyouthNoun性せいnature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); -ty; -ity; -ness; -cyNoun認にん知ち症しょうdementiaNoun