Senility sets in and fills the mind full of delusions... The truth is that there is an arc for all things in life. There is a mid point, at which you realize that you are on the back nine and then the inevitable final decline.Absolute hogwash. Maybe your creative mind worked better when you were younger, but it's preposterous to extrapolate that to be true for every other creative mind that's ever existed on the planet.
When I listen to recordings of my drumming from 50 years ago (I'm now 70) I can certainly hear lots of p*ss and vinegar (a willingness to "go for it"), but I also hear a drummer who wasn't a good listener, and wasn't able to control his musical impulses so he could use them to their best advantage. During the ensuing 50 years I've learned a great deal about how to harness my creativity so that my drumming serves whatever music I happen to be playing. (BTW, that music is definitely not pop music, but that's another thread).
Regardless of my personal experience, I would never be so foolish as to assume that every other creative mind that has ever existed has followed the same creative arc as I did from my youth into my old age.
It is the reason why there are no 70 year old basketball players in the NBA (heck, no one in their 50s either!) and no 70 year old rock stars who have made the best record of their careers. I didn't say not to enjoy every minute, I merely said that it is objectively true that youth brings all things to fruition and advancing age takes them all away. Believe it or not...I don't care... All the evidence is there for you to see, whether you need your glasses to see it is another story altogether.