He is twenty.
He is twenty years old.
He is a twenty-year-old man.
He is aged twenty.
He is at age twenty.
He is at the age of twenty.
He is twenty years of age.
Ⅱ.表示“在某人几十多岁”,用“in one’s+基数词复数形式”,例如:
她五十多岁。She is in her fifties.(从50岁到59岁之间)
还可以借助early,middle,late来表达得更明确一些,例如:
那女孩今年二十二、三岁。The girl is in her early twenties.
Ⅲ.表示“快满多少岁”用进行时或将来时,例如“他快满十八岁了”可说成:
He is getting on for eighteen.
He is going on eighteen years old.
Ⅳ.表示“不满多少岁”,用副词barely,nearly,al-most,quite,yet,just等,例如“她不满十七岁”有以下几种说法:
She is barely/nearly/almost seventeen.
Ⅴ.表示“差多久满多少岁”用介词off,例如:
他差5个月就满19岁了。He is five months off nineteen.
Ⅵ.表示“超过多少岁”用介词past,例如:
他是一个过了中年的人。He is a man past middleage.
那孩子两岁零两个月。The baby is two months past two years old.