At age 55, Mr. Zalokar ran the New York City Marathon in 2 hours 43 minutes 10 seconds in 2015, finishing first in his age group, according to official records. In 2011, he finished the Boston Marathon in 2:34:52, the fastest time in the 50 to 54 age bracket.
According to his website, he was the first runner to win his age group in all six Abbott World Marathon Majors, which are in New York, Boston, Chicago, London, Berlin and Tokyo. He had also competed in marathons on every continent, including Antarctica, where, his website said, he finished first in February 1999 in just over 3:45.
https://www.nytimes.com/2021/07/22/us/fred-zalokar-yosemite-dead.html
and in somewhat related news
https://www.nytimes.com/2021/07/22/us/bear-attack-alaska.html