N-COUNT 老处女，老姑娘（可能具冒犯意味） People sometimes refer to an old or middle-aged woman as an old maid when she has never married and they think that it is unlikely that she ever will marry. This use could cause offence. 老处女，老姑娘（可能具冒犯意味） [disapproval]
Alex is too young to be already thinking of herself as an old maid.