I've had multiple minor head injuries in the last two years of being an engineer at a cosmetics factory, usually from my own clumsiness when fixing or installing machinery in cramped spaces. I've just gone back over some calc 3 notes I made 6 years ago and don't understand a single thing there.
I see plenty of threads on this board about anti-aging technology but nobody asks the question: Is life extension worth it if you just gradually accumulate brain damage until there's nothing of you left?