i-adjective
old-fashioned; fusty; like an old person
Describes a person, behavior, or thing that seems typical of an elderly person, often with a negative or critical nuance of being outdated or musty.
彼の考え方は年寄りくさい。
His way of thinking is old-fashioned.
その服はちょっと年寄りくさいね。
Those clothes are a bit fusty, aren't they?