your marbles idiom
informal humorous精神健康；思考和记忆能力
your mental health or your ability to think and remember clearly
I think he's losing his marbles (= starting to forget things or become crazy). 我认为他脑子开始出问题了。
She's 89, but she's still got all her marbles. 她已89岁，但头脑非常清楚。