The majority of New Testament scholars (Google it) are in agreement that the gospels do not contain eye-witness accounts but represent stories handed down from teller to teller, written from cAD65-110, i.e. at least 30 or more years after Jesus was supposed to have died.
Imagine that you wanted to write, say, an autobiography of Queen Victoria using only what you currently hold in your head with no recourse to the Internet. That's about how accurate the gospels are in terms of what they claim to describe.