That’s utter bullshit to the point where I suspect ulterior motive.
For “rich” you’d need to look at wealth not employment %.
The younger generations are miles behind previous generations on metrics such as age constant net wealth. eg look at the chart in this and contrast that with the economists take:
https://www.google.com/amp/s/www.dailymail.co.uk/news/articl...
(Crappy amp link sorry - on mobile) it’s from page 31 here
https://www.nber.org/system/files/working_papers/w27123/w271...