[UncleOxidant]

I thought I knew how to program 30 years ago (in my early 30s), but now realize that I didn't have much of a clue. So I think I'm hopefully a much better programmer than I was back then - though more aware of my weak areas and the fact that there seem to be a lot of them (the older I get, the less I know). I'm not sure concentration is the issue for me (though it is an issue and I know that social media etc. has killed my attention span) as much as not being able to sit for hours at a time anymore. I've gotta get up and walk around, go outside and move my achy joints. So more of a combination of physical and mental.