by age

基本解釋

The teacher paired off his students by age and height.
老師根據(jù)年齡和高矮將學(xué)生分成一對一對。
In this simple case, customers are only described by age and average balance.
在這個簡單的案例中，客戶只以年齡和平均余額來描述。
By age four, most children have moved beyond the identity of “my mother’s or my father’s child” to an expanded individual identify concerning others in their immediate world.
四歲前，多數(shù)孩子已經(jīng)超越了“我媽媽或者我爸爸的孩子”這一身份認(rèn)同。他們身份的認(rèn)同擴(kuò)充至與眼前世界其他人的關(guān)系之中。

In fact,by age eighty-five, people are happier with their life than when they are eighteen years old.
If you do have it, the disease will always have onset by age 40, 50 or what have you.
如果你有的話，這個病就會從40歲，50歲之類的年紀(jì)0,開始發(fā)作。
耶魯公開課 - 死亡課程節(jié)選
Be a billionaire by age twenty-seven and then retire and...
在27歲的時(shí)候能夠成為億萬富翁，然后退休……
我的夢想是百萬富翁 - SpeakingMax英語口語達(dá)人

They have to be started before the beneficiary turns 18 and used up by age 30.
FORBES: Paying for College: Coverdell Accounts