in one's thirties的意思是more than thirty 还是at the age of thirty?He began to work when he was in his thirties.在此句中in his thirties 的意思是 more than thirty 还是 at the age of thirties?

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in one's thirties的意思是more than thirty 还是at the age of thirty?
He began to work when he was in his thirties.在此句中in his thirties 的意思是 more than thirty 还是 at the age of thirties?

more than thirty

in his thirties 的意思是 more than thirty and less than forty. 三十到四十之间,,中文翻译,就是三十多岁。