is this true ? has anyone noticed how much more difficult it is to perform well past this age ?
I cant even get A's anymore. During exams I will literally space out even on topics that were once easy a few years ago and have to study longer hours now and even then I cant manage to ace an exam like I used to. I even got a C in real analysis (during the final I couldnt remember how to prove a limit with a cubic after I proved a quadratic rigorously my mind wasnt able to use that solution and derive the cubic one logically where as in calc a few years ago I had no problem on the very same exact exercise)

Why did our brains evolve to only be good for a handful of years only to get Robin Williams'd with lewy bodies starting past 25 ?