This is the traditional adult age in Australia and the USA and the UK.

这是澳大利亚、美国和英国的传统成年年龄。

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Even though 21 is the traditional adult age in many English-speaking countries the law nowadays is different in each country.

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。

youdao

At the age of eighteen the law provides adult responsibilities as well as rights.

18岁时，法律规定了成年人的权利和责任。

youdao

So if you think of the effect of technology on the different populations, the young-age and the adult-age learners.

所以在思考技术对,不同人群的影响时，要想到青年和成年学者。

麻省理工公开课 - 媒体、教育、市场课程节选

It is simply impossible for parents to claim a non-disabled dependent adult child over age 24 earning that amount of money.

FORBES: Ask the taxgirl: Medical Expenses and Income Adjustments

Junior ISAs are converted to adult ISAs at age 18 and passed to the ownership of the child to cash in or to continue to invest as they choose.

BBC: Child Trust Funds: What should I do?

Since the system is designed to determine the legal status of workers based on names, Social Security numbers and potentially personal biometric identifiers of every working age adult in America, worries about the system becoming a tool for ever-expanding federal purposes are legitimate.

FORBES: New Immigration Measure Means Expanded Government Reach