That is a highly debatable answer... Some say 40,000 to 50,000 years, however, there is both physical and circumstantial evidence that indicates they have been around longer than any other known civilisation, more than 100,000 years at least!
Some rock art has been dated to 40 000 years ago.
Yes, "How long have you been living in Oxford?" is a good sentence.
Yes
Polygamy has been around for a long time, there is nothing new about it.
"Gilgandra" is a Wiradjuri aboriginal word meaning "long water hole".
Aboriginal rock art has been dated 3,000 to 40,000 years ago.
about 10,000 years
30
The Earth has been habitable for living organisms for about 3.5 billion years.
Aboriginal rock art has been dated 3,000 to 40,000 years ago.
a long time
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