When I was in my late 40's early 50's, I took a short hiatus from woodworking to go back to school for a PhD. When I finished the degree and got back to woodworking, I learned that Mother Nature had played a trick on me. My eyes were not the same as before. I could not see the fine detail I used to see. To compensate, I purchased some accuracy in the form of digital readouts from Wixey and digital calipers of various forms. I also learned about the 5 cut method for multiplying crosscut error so that I could set up my saws more accurately. The end result is that I am a much more accurate woodworker than I was when I could see better. There is an unexpected benefit from the accuracy. I am spending less money on sandpaper. Life is good.
TW