Business - we're seeing older and older senior leadership raking in a higher share of the profits compared to those doing the work.
Government - our elected officials are getting older and older, especially in the Senate.
Schools, churches, etc., etc.
We seem to have lost a social collective norm on how and when to step aside for the next generation. This does not mean one cannot work or contribute past a certain age, it means that their role in an org or society changes.
It's completely understandable to consider this agist, especially if you're nearer to that age.
However, it's a social preservation necessity.
Society needs those who have done to advise and council those who are doing. We've gotten rid of hereditary roles for a reason -- they don't provide the best and most effective solution and means of running government. We should be doing the same between generational shifts in leadership.
For the greater good.