The wife of one of my high school classmates took up ultramarathon running at age 55 after successful cancer treatment. She's now one of the tops in her age group. Her most recent race - 135 miles - was accomplished eight months after hip replacement. A little crazy? Perhaps, but certainly inspirational.
135 miles?
My longest distance, in a 6 hour endurance event, was 18.46 miles. That was not recent.
I've seen reports this week via FB of a 100-miler in the eastern US being cancelled due to weather. Several running friends did this event yesterday,
https://runsignup.com/Race/CA/SantaCruz/SanLorenzoRiverTrailRun . It starts in a park in Santa Cruz and follows the Son Lorenzo River up to a park in the Santa Cruz Mountains near Felton. It has distances of 10K, half marathon, 30K, marathon, and 50K. There's a river crossing along the course, which the half marathon and 30K courses cross twice and the marathon and 50K cross 4 times (the water, from pix on the website, looks to be thigh deep). The 10K elevation profile is pretty challenging, and for the other distances gets near-crazy. Even the 10K is beautiful, running or walking (me) through pine and redwood forest, and the longer the more beautiful.
37 runners finished the 50K, 28 the marathon, 44 the 30K, 129 the half (including 2 friends), and 104 the 10K.