Determining the "youngest" language is tricky because languages evolve constantly. However, if we're looking at languages that have emerged as distinct entities within recent history, Light Warlpiri is considered one of the newest. It originated in the 1980s in Australia and was first documented by linguist Carmel O'Shannessy.
Light Warlpiri is a simplified version of the Warlpiri language, spoken by the Warlpiri people in the Northern Territory of Australia. It emerged as a result of contact between Warlpiri speakers and English speakers. It's primarily used by younger generations and is gaining popularity as a way to bridge the gap between traditional Warlpiri and the modern world.
While many languages have undergone significant changes over time, Light Warlpiri stands out as a relatively recent example of language evolution through contact and adaptation.