My female colleague's office said I was handsome in person, and I said I was over 30 years old. What would she think?

As the saying goes, beauty is in the eye of the beholder. He thinks you are handsome just to admire you. But if you say you are an old bacon, he will understand that you are modest, and he will not understand that you refused him. If you were going to refuse him, you wouldn't say so. In fact, none of these questions can be understood as that he likes you. Let's just say that she has a crush on you and is praising you.