Waldinger's parents were from the same generation as the study's first cohort.

瓦尔丁格的父母与该研究的第一批研究对象是同一代人。

This kind of analysis, where we first choose a group of people, and then follow them over some period of time, is called a cohort study.

这种分析，我们首先选择一群人，然后在一段时间内跟踪他们，被称为队列研究。