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I hope I'm not sticking my nose in this, but you could try another line of questioning with him (assuming he is subscribing the "the appearance of age", or Last Tuesdayism. In that specific case, you could ask why plate tectonics are necessarily wrong. If the world were created five minutes ago, would it be wrong to say that trees are formed from seeds? You can deduce how something came into being without necessarily invalidating his creationist beliefs. At least, maybe. I'm no philosopher and I doubt any line of questioning like this would end well.