A fellow club member is 60 and just completed his 3rd Furnace Creek 508 with a time of 38 hours. That's 508 miles with 30some thousand feet of gain. He also took a run at the RAAM this year but stopped after 1300 miles in 5 days.
BF member Vertical Bob is close to his 4th (I think) consecutive year with a vertical century. That's an average of 10k feet of climbing per week. I think he's 59.