Prophet Muhammad receiving guidance later in life

[Shahmatt]

Assalamu alaikum,

I refer to the article "Exclusiveness" (see link below) and specifically the second point under "PROPHET JESUS'S (pbuh) EXCLUSIVITY":
http://quransmessage.com/articles/exclusiveness%20of%20prophet%20muhammad%20FM3.htm

Can Joseph Islam, or any other kind soul here, please provide reference to the statement that prophet Muhammad received guidance later in life?

Thanks in advance for any help.

[Duster]

Peace / Shalom

10:16

Say: If Allah had desired (otherwise) I would not have recited it to you, nor would He have taught it to you; indeed I have lived a lifetime among you before it; do you not then understand?

[Shahmatt]

Thanks very much. This answers my question.