No, he's looking at causality, not logical entailment. He's not saying the judge is old, therefore he must be wrong on Internet matters; he's saying that the j

No, he's looking at causality, not logical entailment. He's not saying the judge is old, therefore he must be wrong on Internet matters; he's saying that the judge being old is likely an influential cause of his being wrong on Internet matters. Ad Hominem only refers to fallacy of using personal qualities to present logical arguments; it has nothing to do with the use of personal qualities to ascertain causality.