My brother is 3 years older than me, so coming up to the 11+ he gave me some appropriate questions. It turned out I was good at recognising patterns, so that helped too. My school was useless - only 2 of us out of 28 passed, but I'm sure more would have passed, if they had been able to practice with appropriate questions. In the end, three out of four in my family went to Grammar school - one went to secondary modern, but both brothers, the one who passed and the one who didn't, had equally good careers as engineers.
By the way, the secondary modern in Mirfield my oldest brother went to, was the same one that Sir Patrick Stewart, aka Star Trek Captain Jean-Luc Picard went to. Don't know anyone famous from Heckmondwike Grammar though.
I certainly don't remember any trick questions like the old man question. I would have probably answered 'grey hair'.