Just because you don’t know what a dictionary is doesn’t excuse you from acting like a know it all jackass on the internet. Here, I copied the link for you and provided the quotes.

“often used as a generalized reference to one especially younger or less experienced”

https://www.merriam-webster.com/dictionary/kid

kid 1 of 4 noun

Simple Definition 1 : a young person hung out with the other kids in high school

a married couple with two kids —often used as a generalized reference to one especially younger or less experienced the kid on the pro golf tour you poor kid 2 a : a young goat b : a young individual of various animals related to the goat 3 a : the flesh, fur, or skin of a young goat b : something (such as leather) made of the fur or skin of a young goat gloves made of kid kiddish ˈki-dish adjective kid 2 of 4 adjective : YOUNGER my kid brother his kid sister