"The Talmud names Joshua, or Yehoshua, “salvation of Jehovah,”
as the author of Joshua, and Aaron’s son Eleazar the one who added the conclusion describing Joshua’s death. The conquest of Canaan lasted between five and seven years. Joshua led Israel for about 25 years in all. Joshua would have written his book near the beginning of the 14th century B.C." BibleUniverse
And it came to pass after these things, that Joshua the son of Nun,
the servant of the LORD, died, being an hundred and ten years old.
Joshua 24:29