Not every person has seen every game being recommended or just mentioned on the internet. But they've likely seen every game, they played themselves, on the internet, except for pre-internet or analog games that they never looked up somehow.
If that's what you're looking for, that is an interesting question, but I'd assume that most answers here are just as incorrect as this one.
That's already a statement that doesn't apply to me and other "Gen Z" people I know. Which doesn't make it a false claim or an irrelevant point. The changes between milestones / turning points in the western world aren't irrelevant, but people often take them as isolated pieces of information and then value them too much. It's an important aspect about a human being, but it's only one of many uncountable aspects that is superficial on its own.
Generational theory at best serves as a nice sentimental touch that encourages older rich people to feel less entitled and spoiled, because they "didn't have the iPhone when they were twelve" (a product that wasn't available when they were twelve).