It's not a fixed number of years, but figuring 3-4 generations per century is a pretty reasonable estimate.
This of course refers to human generations - animals, plants, bacteria, viruses all have varying generation periods. The following website, however, argues that humans started out with a generation length of 930 years. I'm not sure which database they rely on for their information!:
http://www.millennium-ark.net/NEWS/10_Prophecy/100104.last.generation.html
The fruit fly, Drosophila melanogaster, for instance, has a generation length of around ten days, which is why it is so widely used for genetic research.
One generation is twenty years.
One generation is twenty years.
One generation is 25 years.
There is no specific definition. Many people use 20 years as a general estimate, but it varies. Some use 25 years and some are beginning to use 33 years. A father can be 60 years older than his son and that would make that generation 60 years.
Last Generation was created in 2005.
One generation is 28 years so that is 10,226.79 days.
Yes, the Girls' generation members have been living together and working together for about the last 10 years.
A generation is typically considered to be around 25-30 years in length. This timeframe is often used to mark the time between the birth of parents and the birth of their children.
33, I think
The Last Generation in England was created in 1849.
The last generation
generation X