In the future,people will be able to live till 100 years old.
In the future 在未来
will be able to do sth. 有能力做什么
X years old X岁
human beings can live to be 100 yeas old in the future.
在未来，一般用"in the future"
而人们，在这里应指人类，故用“human beings ”
Life expectancy may reach 100 years in the future. (life expectancy：人均寿命)
In the future people can activities 100 years old
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