To answer the question in the title: I'm pretty sure it happened between '00 and '10. I'm pretty sure we were young and hip through the 90s, but then we hit the middle third of our 30s and the kids started making up their own referents that became popular and ours became age-restricted. Either that or it happened in an instant when Mike D died. Either way, it's definitely happened
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RIP Mike D [spoiler]I like my sugar with coffee and cream[/spoiler]