Who are the Hunzas?

This is an excerpt from the article:

"The Hunzas exist isolated from the rest of the world in the Himalayan Mountains where they live to be 110 to 120 years of age. They have no cancer, heart attacks or other major disorders to speak of. They are active and fit to the end of their lives. Men father children at 100 years of age and older. Overweight people are unheard of because they have the perfect weight control system."

The story then relates research and fact finding visits to Hunza by such notables as Queen Elizabeth, Art Linkletter, N.B.C., The National Geographic Magazine, Frank Shor, Lowell Thomas Jr. and Chou En Lai of China. Visitors to Hunza all came back with the same identical description of the Hunza people:
"Hunza men are straight, tall, broad-shouldered, deep-chested, slim- waisted, heavy-legged and have full heads of hair. Hunza women are straight, tall, slim-waisted, developed bosoms, perfect complexions and luxuriant hair. Both men and women have perfect teeth and eyesight even at 100 years of age and older! They are neat, clean, intelligent and friendly and you can't find an overweight person.
Hunza women at 80 look no older than North American women of 40. Fatigue is virtually unknown. Hunza men over 90 years old repeatedly walk the mountain trail of 65 miles from the town of Gilgit with a full pack and immediately start to work in the fields again!"