Good evening, Anon. We've all had this happening for years. One suggestion is to listen to them, wait until they ask a question or ask them to tell you all about whatever subject they've been drawn to ponder. Let them "edumacate" you, over the other way around. And of course never do a told you so, or be condescending as you know. The word "educate" has an original meaning or "to draw out" of someone what someone already knows. People excel at things they're interested in. People take the questions they ask (if they're okay asking that is) to heart - thats where they learn, not the indoctrination or overlay. It'll be hard for some here soon, be prepared to be light on your feet.
Hope this helps.