While they are amongst the oldest mountains, I think you will find that the Black Hills predates them.
yes if you don"t believe me go to discovery education.com
fergenson
yes, it is. it is in NH and is considered a major mountain range
The Appalachian Mountain Range is an old, rounded range of tree-covered mountains in the Eastern United States.
Volunteering to Build Trails at the Appalachian Mountain Club
The Mining Threat on the Appalachian Trail
Visit the Appalachian Trail in Maine
Effects of Appalachian Mountaintop Removal