<正> In the Caucasus region of the Soviet Union,nearly 50 out of every 100,000 people live to celebratetheir 100th birthday,and many don’t stop at 100!Bycomparison,in America only 3 people in 100,000reach 100.But these Soviet old people aren’t alone.The Pakistani Hunzas,who live high in the HimalayaMountains,and the Vilcabamans of the AndesMountains in Ecuador seem to share the secret oflong life too.