As for your/my attitude, grow up. Speculating wildly with no clue what you're talking about it is liable to get people taking the piss out of you. In this case you literally had to type a question into Google and click on the first link to come up. Instead you had to waste mine and everyone else's time with your nonsense.
But that aside, yes, an adult can be trained to a high standard of opera singing, sufficiently so to take on significant roles in commercial productions. Bearing in mind, of course, that we are talking here about 5-10 years worth of daily training - but it is possible. Just rare.
If a subordinate asks you a pertinent question, look at him as if he had lost his senses. When he looks down, paraphrase the question back at him.