Young-fold mountains are between 10 and 25 million years old, e.g. Rocky Mountains, Himalayans. Old-fold mountains are greater than 200 million years old, e.g. Ural Mountains, Appalachian Mountains. Interestingly, the Appalachians are older but much smaller than the Himalayans
The Aravali Range, the Appalachian and the Ural Mountains are some examples of old fold mountains.
Example: the Tibetan Plateau, the Columbian plateau, the Bolivian plateau, and the Mexican plateaus. Continental plateaus are bordered by the plains or oceans on all sides forming away from mountains. Example: the Antarctic Plateau in East Antarctica.
