Christopher Knight, called the North Pond Hermit, lived in the wilderness of Maine for 27 years. The Lykov family lived in Khakassia in Siberia without contact to the outside world for 40 years. Ishi was the last American native in California to make contact with the Western world in 1911. Before that, he and his tribe had lived as traditional hunter-gatherers. Hiroo Onoda, a Japanese soldier during World War II, refused to surrender in 1945 and kept living a solitary existence on Lubang Island in the Philippines until 1974. Werner Herzog wrote a book about him.
I am certain that there are thousands of others like them, even now. They want nothing to do with civilization. Most of the time they will be alone, sometimes in small groups like the Lykov family. The vast majority don’t have books written or movies made about them, so that we are unaware of their existence. Which is presumably how they like it.
Nehaveigur 