Why does Bud think six is a tough age? Provide evidence from the text to support your answer.

From the text:

Even though it was me who was in a lot of trouble I couldn't help but feel sorry for Jerry. Not only because he was going to have to live around three girls, but also because being six is a real rough age to be at. Most folks think you start to
be a real adult when you're fifteen or sixteen years old, but that's not true, it really starts when you're around six. It's at six that grown folks don't think you're a cute little kid anymore, they talk to you and expect that you understand everything they mean. And you'd best understand too, if you aren't looking for some real trouble, 'cause it's around six that grown folks stop giving you little swats and taps and jump clean up to giving you slugs that'll knock you right down and have you seeing stars in the middle of the day. The first foster home I was in taught me that real quick.