我12岁的英文翻译

Translation: "She is 12 years old"

In English, the sentence "她12岁了" can be translated as "She is 12 years old." This translation maintains the structure of the original sentence while conveying the same meaning in English.

It's important to note that in English, we use the verb "to be" (is) to indicate age, while in Chinese, the sentence simply states the age directly. This is a key difference in sentence structure between the two languages.