Timmy was only 11 years old, but he is already 1.7 meters tall. He is too tall his age, I

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A. at
B. in
C. about
(答案→)D. for
解析：句意：Timmy只有11岁，但是已经长到1.7米高了，我觉得，就年龄而言，他太高了。for〔表示与具体条件作比较〕比起来，考虑到，就…而言。如：clever for one's age 拿年龄来说就算聪明的了。选D。 
考点: 考查介词的用法。