Timothy, the recipient of the two New Testament letters bearing his name, was the son of a Greek father and a Jewish mother. He joined Paul during one of Paul’s later missionary journeys. Paul addresses Timothy as "my true son in the faith" (1 Timothy 1:2). He was probably no older than late teens/early twenties when he joined Paul but had already distinguished himself as faithful, and the elders noticed him. He probably heard and responded to the gospel when Paul came through the area of Derbe and Lystra on his first missionary journey, but we don’t know for sure.