In his twenties 这句话 twenties为什么是复数啊?

In his twenties 这句话 twenties为什么是复数啊? In her twenties 这句话中为什么用twenties 而不是twenty ? in his twenties in his twenties 与in his early twenties 的区别 He worked in his twenties. In his twenties,728 people___in the shop in one's early twenties和in one's late twenties意思是一样的吗?为什么一个是 英语翻译He is a young man in his early twenties. Police described him as a male in his early twenties. 翻译He is in his teens / twenties / thirties /… 对in his twenties划线.用什么提问 在他20岁的时候可以说：in his twenties.