这是澳大利亚、美国和英国的传统成年年龄。
This is the traditional adult age in Australia and the USA and the UK.
尽管在很多讲英语的国家21岁是传统的成年年龄，但现在每个国家的法律都不一样。
Even though 21 is the traditional adult age in many English-speaking countries the law nowadays is different in each country.
下个月他达到法定的成年年龄。
下个月他达到法定的成年年龄。
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