What is the earliest age you see a ring develop?

I just brought home a little bird who was hatched 4/2020. I think it has a ring but read it doesn’t start showing up until about 18 months. It seems to me to be a male by the head and ring. The little guy/gal did say”hi” and “come here, come here” this morning. I’m going to try to post a pic or 2 just in case someone can fill me in.

Thanks!

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