A.) Act your age. What does this expression mean? Please elaborate on your answer.

I think it means that doing something can be helpful to you. 

•  Your sentence is okay and this is another way of saying it.

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=> ACT YOUR AGE means to behave in a manner appropriate to someone of one's age and not to someone much younger.

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B.) Make these sentences into English.

(05/02/22)

-우산 가져가세요.

Take your umbrella

=>  You should take an umbrella with you.

-눈보라가 칠 것입니다.

It will have a snowstrorm.

=> There will be a snowstorm.

-안개가 많이 꼈습니다.

There are many fog/

=> There's a lot of fog.

• Corrected: The sentences are corrected grammatically.