Trying to decide whether or not to name names, but in a sense it doesn't matter. As near as I can tell, ALL companies hate old employees. Various companies have various reasons, but I think high-tech companies (like HP and my former employer) might be the most hateful.
Experience is NOT an asset when no one has experience with the latest and greatest technology. Even if the old folks are willing to work as cheaply as fresh hires, and even if the old folks are fast learners, salary cuts are intrinsically demotivating. You can try disguises like "declining health", but they don't work well and job satisfaction tends to decline. Anyway, the bean counters at the top prefer fresh meat. Cheap.
In Japan the situation is especially critical because the demographic transition is resulting in lots of old people and very few young ones. The Ministry of Health, Labour and Welfare (MHLW) has actually put out "guidelines" that strongly encourage companies to keep older employers who want to work until at least age 65, but the companies are just playing games with the rules.
Without naming names, I'm going to try to summarize "a friend's" experiences. For brevity, AF. The managers started pressuring AF to retire around 55, but AF declined. AF's job and working conditions were steadily made worse and then AF was shoved out the door ASAP, which was AF's 60th birthday. The MHLW had a response. Rough translation: "They aren't supposed to do that if AF wanted to keep working, but tough titties."
Anyway, I'm just an old philosopher, so I get to say "That's too bad" to AF. In philosophic terms, there are four quadrants to consider. Everyone wants to be in Q1 with good work and good compensation, and no one wants to be in Q4 with bad work and bad pay. The interesting cases are Q2, good work with bad pay, and Q3, bad work with good pay. AF wanted Q1 or Q2, but got shoved into Q3 and then Q4.
Me? I'm just an old bum who's outlived my usefulness. Insofar as most of my career was spent in Q1 and Q2, I can't complain too much. However, at this point it appears that my best outcome is to pass away before I exhaust my savings. I would contribute more to the economy if my new focus wasn't on minimizing my expenses, eh? You'd think the companies might be smart enough to worry about the loss of business from all of those penny-pinching retirees, but they obviously aren't that smart.