老人ろうじん Common Noun English jmdict 1 noun (common) (futsuumeishi) old person;senior citizen;the aged;the elderly あの老人は食べ物に難しい。 That old man is a fussy eater.
老人性ろうじんせい Common Noun English jmdict 1 nouns which may take the genitive case particle 'no' senile (dementia, cataract, etc.)