Human is an ever-evolving species. If we starts from _Homo sapiens_ the species, there are traces of human in Africa since 300,000 years ago. For _Homo_ genus, earliest fossil record discovered so far is dated around 2.8 million years ago.

The above dates are based on fossil records. It is completely possible for new fossil emerges with an earlier date. It is also possible that carbon dating, technique used to determine fossil age, may not be accurate. For example if there are more carbon-14 than we thought there would be in the past, we would underestimate the age of existing fossils, pushing human history further back.
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