The day Betty Kellenberger hit a patch of freezing rain on Mount Madison, quitting crossed her mind. She was hungry, cold and sore.

“You’re 80 years old,” she told herself in a pep talk atop a mountain in New Hampshire. “You can do it.” Subscribe for unlimited access to The Post Save on unmatched reporting. Get your first year for $20

A few months later, Kellenberger stood at the Massachusetts-Vermont border, having just finished hiking the entire 2,197-mile Appalachian Trail. She became, without realizing it, the oldest woman ever to do it.

“We put all kinds of limitations on ourselves,” said Kellenberger, who lives in Carson City, Michigan. “Sometimes the biggest one is we don’t get up and try it.”

The Appalachian Trail had interested Kellenberger since she was an elementary schoo

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