According to Prof. Robert Sapolsky, children are the innovators of language, and children speak like their peers. A famous example is a sign language spontaneo

According to Prof. Robert Sapolsky, children are the innovators of language, and children speak like their peers. A famous example is a sign language spontaneously invented by deaf schoolchildren in Child (iirc). The sign language persisted, but after a couple of generations the original generation couldn't even understand the way the new schoolchildren spoke. Children are adaptable and innovative, and both learn and invent new speech. In contrast, adults tend to be rather ossified in their speech and don't change with the times (generally).