So this is not in regards to art, but instead with regards to building software. In my 40s I feel like my brain is finally working. Things which seemed extremely difficult a few years, I can now build with clarity and simplicity. People and political issues which seemed so difficult are now child's play. Consequently, the type of opportunities I am getting are very different from before, and much more interesting.
What have I lost - outside of my most favorite areas, my taste for theoretical CS which previously drove is completely gone. I'm now looking for work that is it's own reward.