Johnny's Entertainment with some SM, YG, and JYP thrown in

Let's get something straight, I know WAAAAAAY more about K-pop than J-pop...it's not even comparable really. But today I was in an Arashi buzz and used a lot of google and wikipedia.

I have known about the existence of Johnny's for a while, how can I not. If you have ever stumbled into J-pop, just a little..,peckishly even, you have heard of Johnny's. The creater/founder/head honcho/etc. is Johnny Kitagawa, born in Los Angeles California. Now the reason I wanted to wiki him is because I have heard about SMAP...well, the only thing I know is that they are Japan's longest running band (boy band...can I even say that? they're old...but well, I call Super Junior boy band...well no, not really). Okay let's call them band idols...yea I need to work that out. Back to the main point, I had heard about their longevity and the fact that they were/are Johnny's. Which circles back to my curiosity about the boss man because I had to find out, just how old is this man.