How old was the N avajo Indian tribe when all of them died?

The Navajo Nation, like many indigenous groups, has not experienced a total extinction; they remain a vibrant and active community today. The Navajo people have a rich history that dates back several hundred years, with their origins believed to trace back to the 14th century or earlier. As of now, the Navajo Nation is one of the largest Native American tribes in the United States, with a population of over 300,000 members. Therefore, the question of their extinction is not applicable.