Old people don’t misjudge the young
Neither I nor any other “oldie” I know is anti-young in any way. However, were they to be asked questions in a similarly vacuous survey, they might be gently coaxed into saying that anybody under 20 was an ungrateful, shallow, inexperienced, useless lump that had never paid its way in the world.
What on earth was the grantocrat trying to prove? The old and the young occasionally don’t understand each other - that has been known for thousands of years and only a profoundly ignorant and/or naïve person would need to try to prove it. Even worse, the publication of these worthless results helps only to strengthen the few misunderstandings that do exist in the stand-off.