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comes of age

成年 / 达到法定年龄

指一个人达到法律或社会认可的成年年龄，通常意味着获得完全的权利和责任。在剧中，Rhaenys 预言如果 Viserys 国王有了儿子，等这个儿子成年后，人们会期望他继承王位。

and chances are better than not that one of those will be male.

And when that boy comes of age and your father has passed,

the men of the realm will expect him to be heir, not you.