elderly
You use elderly as a polite way of saying that someone is old.上年紀的
So "elderly" is a formal and written term to describe people who are old.是書面和正式的用語,表示禮貌
There was an elderly couple on the terrace.
露臺上有一對上年紀的老人.
old people
It is a general phrase to describe people who are old.普通用語,表示老年人可以更詳細一點嗎？不知道還要怎么詳細。一個書面用語一個普通用語。