In 2 John 1:1, the same author ('the elder') addresses an elect lady with the same love-in-truth phrase — parallel opening of another Johannine letter.

In 1 Peter 5:1, Peter calls himself a 'fellow elder', providing a parallel for the author using the same title here.

Acts 14:23 describes the appointment of elders in churches, giving context to the office of 'the elder' used as the author's title.

Acts 20:17 shows elders being summoned, illustrating the authoritative role that the writer claims as 'the elder'.