This is rip off of a Steven Wright joke lol went something like "When I was little my grandfather asked me how old I was. I said, 'Five.' He said, 'When I was your age, I was six.'"
its just an asian parent meme. like they have alot of jokes about studying and puns about good grades. just basically having really high parenting standards. i.e., "you're bra a B cup? why you not have A"