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in reply to @Twinkee's post:

He's kind of right. First evidence of written language is ~5000 years old and from a logistical standpoint, that's the farthest back you can study human civilization within the discipline of history. Other disciplines like archaeology can go back farther. First evidence of agriculture is ~12000 years old. And first fossil evidence of homo sapiens is like 300,000 years old.

But it gets into "how do you define the start of civilization?" Which isn't necessarily the same thing as "how far back can you study human civilization?"