I’m called a prophet of the One Most High
As an adult I’m seen as a very strange guy.
I’m filled with the Spirit to prepare the Lord’s way,
I baptize with water: “Repent!” I say.
I’m a few months older than Jesus, my cousin;
I had disciples of my own, at least a dozen.
Who am I?
P.S. Don't forget to check the answer to yesterday's riddle!