Stonehedge was not born but made by someone or something unknown to mankind at this time although there have been many Theories such as Aliens (Unlikley) or it could be a Observation point for something. In answer to the question no one knows
people of roughly the same age can be called contemporaries.
A generation is a group of people born at roughly the same time. A contemporary is someone living in the same time period.
The Great Pyramid Of Giza
The Great Pyramid Of Giza
There is no clock. It does, though, follow roughly the same time as howrse.
The New Moon rises and sets at roughly the same time as the sun.
No they was not born at the same Hospital or at the same time
The Wolf and the Horse have been around for roughly the same length of time, as they evolved over the same time frame.
they are called 5 babies born at the same time
Same time as anywhere else in the Northern Hemisphere; roughly March to May.
Tennessee Williams
The Zapotec and Maya civilizations flourished and declined in nearby regions at roughly the same time.