~ Kali Yuga & Others : 3 ~

Satya Yuga (also called Krita Yuga) : This first age is 1,728,000 human years. Also known as the Golden Age or age of Truth. The qualities of this age are: virtue reigns supreme; human stature is 21 cubits; lifespan is a lakh of years, and death occurs only when willed.


Treta Yuga : This second age is 1,296,000 human years. Also known as the Silver Age. The qualities of this age are : the climate is three quarters virtue and one quarter sin; human stature is 14 cubits; lifespan is 10,000 years.


Supportive statement : In Valmiki Ramayana it is stated that Lord Rama lived for 10,000 years after the war. He went for Vanabas in the age of 18. Stayed there for 14years and after that he returned to Ajodhya.


Dvapara Yuga : This third age is 864,000 human years. Also known as the Bronze Age. The qualities of this age are : the climate is one half virtue and one half sin; lifespan is 1,000 years.


Kali Yuga : The fourth and last age is 432,000 human years. Also known as the Iron Age. This is the age in which we are presently living. The qualities of this age are : the climate is one quarter virtue and three quarters sin; human stature is 3.5 cubits; lifespan is 100 or 120 years.


http://gyandotcom.wordpress.com/2008/08/06/the-maha-yug-satyugtretayugdwapar-yugkalyug-the-reality/