You’re absolutely right; I meant to write it from the perspective of having 100% large-cap, which would be quite bizarre for an octogenarian (unless they immortal?). I’ve amended my answer to make that clearer.

Also, I’ve realized that I didn’t touch upon non-personal investment. That is to say, institutional investors like university or charitable endowments, or sovereign pension funds. The simple answer is that they essentially have an indefinite lifespan, and so play an entirely different game than personal investors or even millionaire/billionaire investors.