I have seen several times expressions like: "10 yo just watched..."
By context I understand that is a father referring to his 10 years old son. I have seen it in Twitter by different people. Are these the initials of Years Old? is this just a Twitter thing? would anyone use that in a regular conversation?
I find surprising that he says "10 yo..." and not something like "My 10 yo..." It seems like "10yo" becomes like a name.
I could not found any information in any dictionary, not even Urban dictionary.
(I am not native English. I live in a small country in Europe)