I would expect that they will look carefully at the ages of employees and their salaries when they move people around.
Last time they reorged in my area, they put most of the older people in one group. They were not able to work together and had to work separately with groups in India. Trying to get them to leave, I think. Some of them have left.
I was older also, but was put in another group where they said they "didn't have enough senior people". I was then attacked and harassed until I left. I don't know if that was the original plan? I did very good work, got 4's and 5's on my reviews for years, got huge bonuses, and then nothing. Manager I was assigned to, would not assign work to me.... I expect he was saying that I was not doing any work. I then went out on a limb and wrote a new application to replace another application that I was told was worst application in its area. Just caused more harassment and project given to others who then destroyed it, either deliberately, because I wrote it, or because they were all so incompetent that they could not possibly continue.
It's a very sick place. You may feel safe where you currently are, but you can be moved anywhere and have no choice about it. Management can do anything they want to get rid of the older people. Unless you can prove that you are being harassed BECAUSE you are in a protected group, you can't sue. I endured some severe harassment, nothing against the law about it. Your co-workers can literally do anything they want to you with no consequences. Particularly if the management above them just wants to get rid of senior people, and they don't want to know the details. They just want the older people gone.