[bri3d]

Early 30s here: focus has been the most important thing for me, and the resource that's been in the greatest decline.

I used to be able to multi-task to the point that I never really had to explicitly consider what I was doing: I could address everything, everywhere, well enough to not worry about it. I didn't have to reject incoming tasks or make a list and plan for my day, because I could meander through and come out the other side successful.

Now I am probably just as capable as I was at an earlier age, and in many areas more capable, but I need to manage my focus explicitly as a resource. I can only do so much in a day, now. This means I need to explicitly reject work which I am not able to do, make lists, and maintain a personal backlog and "actively working" section.

Make sure if you do this that you consider your personal life and obligations at least as important, if not more important than your work ones, or you can also easily tunnel vision into work tasks.

Also, with respect to your comments about programming solutions and co-workers - consider that you may have just moved up in the world, and are now solving harder problems with more experienced people.