The Catechism in Questions & Answers

586. How long were the Apostles active?

The Apostles were likely active until the end of the first century AD. John is thought to be the last Apostle of the early church. After this began the period in which the Apostle ministry was no longer personally occupied, even though it did not cease to exist. It was not until the nineteenth century that the Apostle ministry came to be personally occupied again.

Personal occupation of the Apostle ministry: see Question 450. and explanation Continuation of the Apostle ministry: see Questions 447. et seq.