R’ Shmuel had a heart attack on shabbos and walked to Maomonidies , a good 1 to 2 hour walk.
I learned in South Fallsburg years ago, and R’ Elya came for shabbos bc his it was his grandchilds simcha. Anyways, he stayed up the whole Friday night learning and giving chizuk to the bochrim. It was truly amazing. In both stories, they were not young men.