I just turned 43. I've been going through this transition a little late in life. I think what spurred it on for me was watching my kids raise their kids. (Yes, I'm a young Grandfather.) I saw them so wrapped up in unimportant things that they were missing the joy their children were living. Even worse they were trying to wring the joy out of them. I realized that the only "real" people I know are under 8 years old or act like it. There is nothing more important than realizing that the only thing worth living for is the simple joys in life. My Grand kids are teaching me this.
Today, I am ashamed that I was so lost for so long. Live your life Phil. Find and live the joy. If your friends can't deal with it then let them go. You will find new friends that share your joy and your life will be that much better for it.