Ummm, the Earth is 4.6 billion years old, one celled organisms appeared soon after soooo... 😏
 13.8 million years is more than life of planet earth? It may be a biblical whim which does not stand any scientific scrutiny ! Earth is nearly 4.5 billion years ! Life on earth is eastimated to be about 500 million years for the fossil record , possibly 4 billion years , just after the planet cooled and formed a crust and started to have some water on microscopuc level which left no fossils !