No one knows for sure. So I am just going to go out on a limb and say that they are younger than 3 billion years old, but older than a billion years old. That’s a huge range, I know, but if you keep reading, at least you have an idea of the timetable: Earth (about 4 and a half billion years old—give or take a bunch of milions); first “life” appears (3.8ish billion years ago) although these were very basic cells and no one has any idea exactly when this happened — they could probably be off by 100 million years so lets say at least 3.5 billion years ago we had something floating around “alive” — a carbon based lifeform — in the oceans; then maybe 2 billion years ago (much, much, much, much, much later compared to when the first “living” things showed up, earth gave home to more complex life forms (and sometime around then is probably when the amoeba’s distant great^127365 cousin showed up)… no one has any idea exactly when amoebas were first born (something had to evolve into it first, and no human taxonomist was there watching at the time, so there’s incredible uncertainty in all these types of questions)— but it’s cool that scientists have been able to put together and share a theory that makes good sense to most people and can be verified by studies as well as the geologic record. Cool to me at least. This might bore someone else to death, say someone who is concerning him or herself with the problems of NOW!
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