My sister came for a visit from out of state and, by her example, reminded me of a principle that I had sort of forgotten. And how powerful it is! It works with everyone, young and old, but it is especially effective for getting cooperation from children.
My sister asked my teenage son to tell her about his interest, which is Botany. I heard them in the kitchen discussing all the things he planted this year in his garden, and which varieties were unusual and how Spanish peanuts have a bright orange-colored blossom, how his kohlrabi should be harvested when it is 3-4″ in diameter, and other details. He got out his seed packets and explained each one to her. I mentally worried that he was boring her.