The apostle John wrote this letter, along with 2nd and 3rd John, and the Revelation sometime after A.D. 90.
He is an excellent example for older men not to give up, as long as we have breath, and keep serving the Lord.
John shows tenderness in his old age, addressing his readers as his “children.” Men who follow Christ as they mature, become less dogmatic and more sensitive to those around them. John speaks of often of love and writes it, or a form of it, thirty-seven times.
John’s epistle one of how Christians may retain fellowship (not salvation) with the Lord: He is writing to believers (5:13).