Will it ever end?

So Alex has had a little attitude problem going on about 2 years now. Everyone warned me about the terrible twos and that was a joke, Alex was an angel when he was 2! Then came 3. The HORRIBLE 3's!!!! And I figured at 4 he would be better. WRONG! Maybe 5? WRONG again! I really do not get this at all. Kindergarten has mellowed him a little to the point where some days he is so well behaved it is crazy but then he will do a 180 at some point in the week and be a demon! I don't know if it is because towards the end of the week he is tired from being up so early and so busy all week, or if he is trying to drive me insane! I think either one of those is a possibility.
And I know that I am not the only parent who has this issue. Apparently it is a big thing for kids around 4 to start having this attitude. And it always seems worse with the first born. I really think part of it is that Alex spent his first 3 years around mainly adults. I mean sure there were kids at daycare and some play dates, but mostly he was with Rob and me or his grandparents, our friends, or his aunts and uncles. So I think somewhere along the line he just assumed he was a adult as well.News flash Alex you are not! I really hope that Zach and Addie do not get this "attitude" problem since they have always had other kids around but we will see. And I hope it goes away soon. I mean the kid is almost 6, I know he knows better, I know he does not like being punished, but sadly he is just like me and knows how to push my buttons.
Rob on the other hand loves it. He tells me all the time how Alex is exactly like me and it is like watching me fight with a smaller version of myself! This is just something people never tell you when you have kids. They say to treasure the time because they grow up to fast... well I wish he would grow just a little faster so this stage would be over!