It sounds like you are focussing on/ taking on too much about the therapist to me. I don't believe you can make someone else angry and if the other person becomes angry, it is not a matter of fairness. If the therapist chooses to continue working into her 70's, then she gets the full range of what being a therapist entails and it is kind of condescending (in my opinion) to think that because of her age she cannot handle all the job entails.