“Thanks for asking.I am actually in the midst of making a decision about that, even as we speak. Thanks for your interest.” Now change the topic, “And how is your family doing? What’s new with little Moishy/Saraleh/Dovid/Estie????”
BTW, if someone has the chutzpah to ask anyone a REALLY personal absolutely-none-of-their-business question, the proper response to that is, “I’m really surprised that you would ask me that!” And change the subject.