Humans likely began talking as soon as humans evolved which was over 2 million years ago.
Humans have been around for a long time but not as long as the earth has been around.
The earth has been around much longer than humans have and even dinosaurs roamed the earth well before humans ever did.
But according to scientists it's estimated that humans began talking from as long as 50,000 years ago to around 2 million years ago.
Unless we were there then there's no real way to know 100 percent for sure about when humans began talking.
But I would assume that as soon as a human was born and got to the age of talking then that's when it happened.
Humans likely always had their talking voice years ago.