Geriatric is used to describe things relating to the illnesses and medical care of old people.
There is a question mark over the future of geriatric care.
老年保健医学的未来是一个问号。
geriatrics
If you describe someone as a geriatric, you are implying that they are old and that their mental or physical condition is poor. This use could cause offence.
He will complain about having to spend time with such a boring bunch of geriatrics.
不得不跟这么一帮无聊的老家伙待在一起,他会满腹牢骚的。