20,000 years ago is way too recent. Aboriginals arrived in Australia 50,000 years ago after which they were basically isolated from the rest of the world until

20,000 years ago is way too recent. Aboriginals arrived in Australia 50,000 years ago after which they were basically isolated from the rest of the world until the British arrived. Unless you believe humans developed language at least twice it has to have happened before that. Also there are several stories which are believed to be quite a bit older than 20,000 years.