There are probably more people living in caves now than ever before.

All the dinosaurs died millions of years before the first cavemen. Dinosaurs died out 65 million years ago, and there weren't even any apes at that time. One reason all the dinosaurs died was because a big meteor hit the earth, in the Gulf of Mexico.

Here's an article about cavemen on the internet in Wikipedia: caveman

Cavemen are partly pretend, because we don't know a lot about how people lived that long ago, so people make up a lot of stories. Some ancient cave people made exciting art on the walls of their caves, showing lots of animals. A lot of people probably lived in tents at the time of the early cavemen, because there aren't so many caves, as compared with all the land that doesn't have caves. But it's hard to find the remains of the tents and the people who lived in them, compared with caves that keep things protected.

You might like to read about the Iceman. He was killed 5000 yrs ago on a mountain in Europe, and then he froze and was buried in ice. Here's a link to a story about him:

iceman