He had the agility of a man half his age.
这句话中,a man 为名词,half his age 名词短语作定语,两个名词性成分连接在一起,中间是否可以加入介词of,即:a man of half his age ?
a man half his age 和 a man of half his age 都正确。如:
She needs a friend of her own age to play with. 她需要一个同龄人一起玩。(《牛津英语搭配词典》第2版英汉双解版p.29)
    I have a daughter (of)your age. 我有一个跟你同龄的女儿。 (《英汉多功能词典》新编升级版 p.33)
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