I see this issue raised over and over again as if nobody knows it's happening. It is. Everybody knows it's happening. But don't expect anything to change because everybody knows about this.
Remember that article a while ago that put together actual evidence that IBM was laying people off based on their age? Everybody was talking about it, it was all over the news... And what happened? It faded from everybody's memory within a week or two. Without any consequences for IBM. Nothing came out of it.
So yes, there is age discrimination at IBM. It'll continue. And there is nothing we can do about it. Deal with it.