On the Lord’s Day I was in the Spirit, and I heard behind me a loud voice like a trumpet, 11 which said: “Write on a scroll what you see and send it to the seven churches: to Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia and Laodicea.”
NIV. (Re 1:10–11). Grand Rapids, MI: Zondervan.
Is the true church the Catholic Church, Baptist, or churches of Christ? Which of the seven churches listed above did Christ claim as His own? Clearly being the oldest wasn't listed as one of the attributes He desires. The Lord is looking for those who love Him, and humbly worship Him in spirit and truth.
All of them. They were all local churches, just as we have today the Diocese of Fresno or the church at Fresno or the Diocese of Los Angeles or the church at Los Angeles that belong to His Church. And they are all Catholic.
"Clearly being the oldest wasn't listed as one of the attributes He desires."
It's a matter of being the right one and that is the one that has the pedigree going right back to the first century.
When did your church start?
If it wasn't in the first century then it can't possibly the one established by Christ.