why did i dream of someone i Haven't Seen In Years ?

i had a dream about a old coworker who i have not seen, talked to, or worked with for 5 years now.

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I have dreams about my childhood friends or schoolmates I haven't seen in 15 years. I can't even know what they look like now.
Or I have dreams about famous people or people from social media sites I have never seen anywhere other than on the screen of my computer. How weird is that!