If you have regular periods then 5-6 weeks is too long since your last period. If you are 16 years old, you may be experiencing irregular periods. It happens.
about 100 years
55 million years
It lasts for a period of few months to a period of 20 years.
24 Years
You work out how long it is since the FIRST day of you last period.
The most recent ice age, known as the Last Glacial Maximum, occurred approximately 20,000 years ago. Since then, the Earth has been in an interglacial period characterized by a warmer climate.
The Devonian Period lasted for about 63 milion years. It occurred 354-417 million years ago.
87 years
259 years (480-221 BC)
About 600 years, from 300 B.C.E. to about 300 C.E.
At last calculation about 1,928 years
110 years ago :)