“The older people are the only ones who can tell you what their youth stands to lose,” he said. “The young are the only ones who can articulate the loss of an identity rooted in a mother tongue that has become foreign to them.”
I work in Navajo language education. Most insecurity in Navajo adults derives from this single disconnect. It seems later in life, in those that have connected "to the rest of contemporary humanity" at the expense of learning their language, give up because of the complexity of the language, especially the verb.