Alternately, it's example of how absurdly some obsess over it.
Excepting bad luck and pretty-obvious excess, almost everybody will have about 6-7 decades of adulthood and maybe 1-2 decades of slowing down and feeling less capable in the last of those. If you can come to terms with that, and many do, there's not a lot to worry about.
All the obsessing people get up to here is a kind of "premature optimization" that often sends people flailing around between research trends without any of the rigor or continuity that might have yeilded benefit anyway. It's a lot of time, effort, and mental energy stolen from the most vibrant and impactful stage of life in questionable hope of squeezing a teensy bit more out of the least.
Excepting bad luck and pretty-obvious excess, almost everybody will have about 6-7 decades of adulthood and maybe 1-2 decades of slowing down and feeling less capable in the last of those. If you can come to terms with that, and many do, there's not a lot to worry about.
All the obsessing people get up to here is a kind of "premature optimization" that often sends people flailing around between research trends without any of the rigor or continuity that might have yeilded benefit anyway. It's a lot of time, effort, and mental energy stolen from the most vibrant and impactful stage of life in questionable hope of squeezing a teensy bit more out of the least.