Is anyone else "mellowed out" by 40+

When I was in my 20s I was determined to be super successful, hot girlfriend, drive a fast car. I was very opinionated.

At 40, I'm mellowed out. I just don't care anymore. It's just meh. All I want to do is go the gym everyday, cook my meals, get a full night's rest and maybe watch a movie.

Is anyone else similar? How do you deal with it?