I spent 15 years with HP in their services division. I liked the work I was doing, even though I was slightly underpaid for it. I would have stayed there but they cut me loose back in 2014 with 50K other employees. They did give me a decent severance package (3 months pay with health insurance) but it was shocking how easily they just cut me loose after years of dedicated service. In the end they did me a favor; I've spent the subsequent 10 years doing interesting stuff for four different companies in that time. I'm in my mid 50s now and thinking about optimizing for a decent retirement sometime in the next 10 years. I don't know if I'll be forced to change jobs again or not.

Yes I regret being with HP for 15 years; I had a lot to learn to be marketable again after being there for that length of time. But since I'm working toward retirement now, I will probably try to stay as long as I can where I am.