The original number of apostles chosen by Jesus was twelve. After the death of Jesus, Judas Iscariot, who betrayed him, was replaced by Matthias, keeping the number at twelve. However, many of the original apostles eventually died as they spread the teachings of Jesus, and the Bible and tradition do not record any of the original apostles as still being alive today. So, in a historical and modern context, no original apostles are left alive today. The early Christian church considered Paul and others like Barnabas, Luke, and Matthias as apostles as well, but these were distinct from the original twelve. To summarize: The original 12 apostles included Peter, Andrew, James the Elder, John, Philip, Bartholomew, Matthew, James the Less, Thaddeus, Thomas, Simon Zelotes, and Judas Iscariot (replaced by Matthias). After Jesus's death, these twelve spread Christianity but eventually passed away. No original apostles remain alive today.
