What are your sources for what you claim to be truth so I can go read them.I am not. But you stated as though it were fact something that is not at all fact. John was not exiled at 90 to Patmos. He was in his early 60s or late 50s and was still a vital man. It is the futurists who insist it was written after the fall of Jerusalem for their eschatological purposes. Because it is in wikipedia or any book does not make it so. They could write that Jesus was a myth and that would not make it so. John was feeble in his 90s and could not even walk.
Nero exiled John to Patmos after boiling him in oil as well as had Peter and Paul killed around the same time. That is what some records of the time say. There is only one person who wrote it was Domitius and futurists have interpreted that as later for theological reasons. That John traveled to Ephesus as well as other places in decades before does not matter. He was exiled to Patmos under Nero. The revelation he received was sent to the churches because they were about to experience the worst persecution ever by any people as the enemy was allowed to defeat them for 3.5 years whereby many of them would be killed. The Christians came out of Jerusalem remembering the prophetic words of Jesus and avoided destruction.
If you want to talk historical events, then please do not try to silence those who disagree with your view by insisting no particular theology is allowed. We are talking what happened in history and the evidence for John writing Revelation 60-68 AD is stronger than Encyclopedia Britannica. I know the majority have been taught it was later but that is due to good publicity and not good scholarship. The man was not in his 90s ministering still in churches in the world.