attheageof的意思是在xxx岁时
例句:(a)Attheageof20,wedon'tcarewhattheworldthinksofus;at30,weworryaboutwhatitisthinkingofus;at40,wediscoverthatitwasn'tthinkingofusatall.
(b)Torentacaratage20requiresacreditcardandpayingadditionalfees.
(c)Atage20,YujaWanghasalreadyestablishedherselfasafamouspianist.