According to the AARP, there are signs older workers can watch out for:
Older workers are being fired or offered buyouts, and younger ones are being hired.The most
common term for this is "culture fit."
You are reassigned to unpleasant duties.
You start hearing tacky comments about your age.
You stop getting raises.
Your performance reviews tank.
https://www.lohud.com/story/news/2018/08/29/sell-date-employees-ageism-and-rethinking-retirement/1086814002/