# Age of universe ~15,000,000,000 years.
# Age of earth ~ 4,500,000,000 years.
# Age of humankind 3,000,000 years
from
http://www.rae.org/bits02.htm


The Age of Dinosaurs
About 230 million years ago, a group of animals called dinosaurs ruled the earth. They lived in many different habitats, from open plains to forests to the edges of swamps, lakes, and oceans.
About 65 million years ago, it is believed that a huge meteor hit the earth, causing enormous clouds of dust to block the sun's rays so that the earth became dark and cold for a number of years. Huge tidal waves flooded low-lying land and acid rain fell. Small animals could find shelter and enough warmth and food, but the huge dinosaurs could not. They died out. They were the most successful land animals, having existed for about 160 million years.


from
http://www.kidcyber.com.au/topics/dinosaurs.htm