Always has been. This is where the whole "Dark Ages" idea comes from, IIRC: people further on in time wanting to separate themselves as special and more advanced.
Millions of years, likely. The whole reason we’re successful is because our pre-human ancestors were empathetic and cooperative enough to build societies.
We see those same traits in many other primates, and they’re not something it makes sense to evolve, lose, and evolve again. Those traits predate us.
Language almost certainly predates us, since we see it not only in other primates, but in non-primate species, too. And based on the humour we see in many animals, you can bet we were making dick jokes nearly out of the gate.
Societies weren't built on empathy, they were built on security. Not just physical security but food as well. No society in history was built on empathy, ever.
What about caring for the elderly and disabled? We see anthropological evidence of many behaviours that can only be explained by compassion and empathy, some of which would have actually detracted from security.
The notion that the early formation of societies was based on security rather than empathy is outdated. Compassion has many evolutionary advantages, especially in primate species where offspring are born vulnerable. It’s clearly evident in other primates who live in groups (or ‘societies’), as a driving force of cooperation and group cohesion.
Those papers are both fascinating reads, and I highly recommend them for a deeper understanding of why and how empathy is crucial to our success as a species.
Right, and I don't doubt you, empathy is how society grew. But empathy is not why society started.
Keep in mind that you wanted to keep old people in your tribe to look after the children. The men and women were looking for food and firewood and building materials. Losing children means the end of the tribe. Feeding the elderly is still security. It simply makes sense from a survival standpoint.
Obviously they had empathy as well. If you didnt, you wouldn't bother to bury the dead, let alone give up valuable items as offerings, such as an ax. As far as I'm aware, that practice dates back at least 40k years. So obviously there was empathy there.
However, I would say that that empathy comes from security. "They were one of us"
But a rival tribe member dies? Do you think they would gather for that scenario? That would be empathy. And there's no proof of that in a prehistorical context.
Our ancestors' brains went from chimpanzee-sized to modern-sized (actually slightly bigger than today) between two million and one million years ago, and more importantly the language-governing areas increased in size during that stretch. So human beings a million years ago were very much like us today, just without the advanced technology.