[Edit] Don't know about other states.
Just replace age descriptions with race descriptions to see how weird and out of place that is.
> She was white, had been with the company for four years, and was told without explanation by her latino manager that she had two weeks to get out.
Age implies obsoleteness and poor health. (I can stereotype too!)
However, it's the matter of how strong that causation is and how hard are you going to rely on it. Because if you think that someone in their 30s is likely to be be significantly more experienced and wise, it also means that you should think that someone in their 50s is likely to be significantly burned out and slow.
My point is: the correlation (and underlying causation) is there, but it's not strong enough, compared to differences between individuals.
How is that in any way a sound analogy? Your age likely has an impact on your experience. More experience doesn't necessarily mean you're better at your job but it's a decent possibility. Race has no impact on performance at all.
Obviously nobody is going to discount a manager because of their race, but on that same coin people shouldn't discount the same individual because of their age.