When did humans first appear on Earth?

around two million years ago
The first humans emerged in Africa around two million years ago, long before the modern humans known as Homo sapiens appeared on the same continent. There’s a lot anthropologists still don’t know about how different groups of humans interacted and mated with each other over this long stretch of prehistory.

When did humans first leave Earth?

Early human migrations are the earliest migrations and expansions of archaic and modern humans across continents. They are believed to have begun approximately 2 million years ago with the early expansions out of Africa by Homo erectus.

How old is the human race?

about 200,000 years ago
While our ancestors have been around for about six million years, the modern form of humans only evolved about 200,000 years ago. Civilization as we know it is only about 6,000 years old, and industrialization started in the earnest only in the 1800s.