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.
Oh, so the Lord picks out a church, and the members can live without faith. Maybe some of your churches are the ones at Ephesus, and Christ has removed His lampstand. Rev. 2:5
Are you a member of the church at Pergamum, and have members holding to the teaching of Baalam? Likewise, do any of your members hold to the teaching of the Nicolaitans? God looks at the heart and not if someone is a great-g-g-g-grandson of someone who had faith. It's the faith He sees now, not what your ancestors did for Him.