At age 61, Eberhart became a perpetual walker. In his following 15 years, he walked roughly 34,000 miles. During that time, he published some books. One of which is about one of his first hikes, Ten Million Steps: Nimblewill Nomad's epic 10-month trek from the Florida Keys to Quebec.
In early 2019, Nimblewill had settled down on Flagg Mountain, Alabama. It was noted that Eberhart had "announced his retirement several times in recent years before venturing off on yet another odyssey."
Eberhart strode into the record books on November 7th, 2021, as the oldest hiker to complete the Appalachian Trail at 83 years old.