If I had to guess, most folks at my last office were between the ages of 20 and 45. We only saw one retirement during my tenure. A few folks left to a local startup and did far worse than when our company IPO'd and 100x'd our options. I could name everyone that left and count them on my fingers.

We collectively maintained a spreadsheet of Atlanta hiring dates and frequently compared our seniority against our colleagues based in SF. Most of us were in the top 5%, according to an internal employee registry API that could tell you your seniority rank.