What does it mean when you’re 24 years old and a customer calls you “kiddo”?

I get mistaken a lot for being younger than my age lol. Maybe it’s the healthy habits I do. This lady at my job said “bye kiddo, have a nice day” I said thank you and laughed, then the other day my coworker asked me how old I was, I said I’m 24, she was like”wow I thought you were like 20, you look young”

What does it mean when you’re 24 years old and a customer calls you “kiddo”?
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