How about Peter, Paul and John? - Apostle Peter died about 30 years after Jesus and was considered the senior leader of the disciples. So I’d say he had first-hand knowledge of Jesus as described in 1 Peter 2:21-25. Peter knew Paul and spoke of him in his letters to the Colossians and Ephesians. The apostle John also knew Jesus and referenced Peter when writing to the Philippians. Peter was killed during the reign of Nero, approximately 65-67AD, meaning he and the other apostles were in contact with each other and were spreading the Gospel for decades in spoken and written word.
Or - my kids keep telling me to get my life stories down in writing. The first time they mentioned it was probably 10 years ago. Heh - I still have time.....