Nice post, mixture of curiosity, funny and sadness..
at the age of 80, prof forget that he come to supermarket and head to school in a bus, was funny, my father on the age of similar forgets everything, sometimes our name even...
Me on the age half of it do frequently become absent minded as well, to much focus on some thoughts on my mind until i forget where am i heading while driving... :)
It is a great loss, having legend leaving us behind, but that is life, nothing is permanent, but the memory lives forever... nice nice post... :)