My grade school teachers, whose average age was about 96, could see better with the eyes in the back of their heads than the ones in the front.
At the little Calvert school I went to in Istanbul in the 50s the principal was 90 years old the last year I was there. She probably weighed rather less than 100 pounds. I watched her once smack a 7th grade boy against the wall. In the nineties a fellow walked into my brass shop in Florida and we talked some while I worked. It turns out he had gone to the same school 11 years after I had been there. He told me about Mrs. Kelly the principal. He said she was awfully old but could still run up the stairs. Well, Mrs. Kelly was the name of the principal when I was there so she had to have been 101 years old.