Yes, the headcount is set, young and old lined up in order of age.

原来如此，设置一下人的排列，按照年龄以年轻到年老的顺序排列。

At the age of sixteen, Darwin was sent to Edinburgh University to study in order that he could become a doctor.

十六岁时，为了成为一名医生，达尔文被送到爱丁堡大学学习。

Ben holds dear an ambitious goal to retire at the age of 55, but there is nothing concrete that he does in order to succeed.

班有个远大的目标就是要在55岁的时候退休，但是他却没有因为这个目标而做到任何具体的计划。