Today is my brother's thirty-year-old birthday
thirty-year-old用连词符号连起来就相当于整个变成了一个名词，这样用很方便的。注意就是year不能再写成复数了
Today is my brother thirty years old birthday
today is my brother's birthday for 30.
Today is my elder brother's 30 years old birthday.
Today is my brother's thirty-year-old birthday
Today is my brother thirty years old birthday.
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