The last time Tom Murphy skied all the way across Yellowstone National Park from south to north, he was 34 years old and weighed 165 pounds.
When he sets out on Saturday to re-create that expedition, he will be 64 years old, with a weight of 180 pounds.
“I’m sure I can do it,” he said Monday in a telephone interview from his home in Livingston. “That truly is not a concern of mine. The concern I have is whether I can keep up with these young people.”