I know what you are trying to say, but I have known engineers in their 70s who have a really hard time grasping new concepts, and your splitting weight analogy doesn't cover such things, you can't "divide a concept".

Yeah, we should be good with each other and nice with each other, but sometimes that is not in line with how the market/capitalism works. I don't think I was completely right but I don't think neither are you.

Brain plasticity is a real thing, and it goes away really quickly, is depressing but is a reality, I'm 27 but I already feel my reflexes are a bit worse than when I was 24, here is a nice video that gives some perspective about the issue, you may have seen it before (reverse bicycle): https://www.youtube.com/watch?v=MFzDaBzBlL0