How long has Humanity been on Planet Earth?

[Ferrocyanide]

In Genesis 2, the 4 rivers mentioned flowed together. This is only possible during an ice age (130,000 - 13000 years ago).

The earliest undisputed evidence for human industry comes from carbon-14 dates establishing that humans used tools to grind roasted grains into flour at least as long as 32,000
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Range 130,000 - 32000 years ago

There is a few problems with your claim.
First, let's see what the Bible says

Genesis 2:10 KING JAMES VERSION
And a river went out of Eden to water the garden; and from thence it was parted, and became into four heads. {2:11} The name of the first is Pison: that is it which compasseth the whole land of Havilah, where there is gold; {2:12} And the gold of that land is good: there is bdellium and the onyx stone. {2:13} And the name of the second river is Gihon: the same is it that compasseth the whole land of Ethiopia. {2:14} And the name of the third river is Hiddekel: that is it which goeth toward the east of Assyria. And the fourth river is Euphrates.

The above is interpreted to mean that there is 1 river. Some think its starting point is the tree of life. Once it exists the garden of Eden, it splits into 4.
It is after that that you have 4 rivers and a name for each.

I’m not sure how 4 rivers become one during an ice age. Can you explain?

The people who wrote these stories were not geographers. They did not travel around to figure out the coordinates of a river.

In fact, Tigris and Euphrates merge together in Iraq. I think this was Assyria back then.
You can see it on a map here:
https://en.wikipedia.org/wiki/Garden_of_Eden

The writers of these stories are heavy into religion and light on facts.
So, the story is made up and this is why people have been having a hard time finding these mysterious rivers. Pison and Gihon.

As for 130,000 to 32,000 y ago, there was no jewish culture, no greek culture and probably the same goes for all the others. I’m guessing they were just a few tribes living in the Mesopotamia area.
None of them recorded an ice age.
Let’s put it this way. The people from 5000 BCE have no info about 10,000 BCE and before.
They don't even know when it was figured out how to make importing things like copper, zinc, tin, pots, cloths, needles, knives, arrows.

I remember reading about Plato’s story about Atlantis. He claims that the story comes from his great-great-grandfather or something who heard it from some other greek who heard it from another and goes all the way back from greeks from 10,000 y before Plato’s time.
But there is no greek from that time period.
No evidence of an Atlantis either.