Phase 1: You have your first cup of coffee
The timing of everyone's first cup is different, but it will likely be after the cooties era, but close to when the clock strikes puberty. Maybe it's at the neighborhood diner or on a lazy Saturday morning at home, but no matter where it is, it will taste like a blend of dirt and paper and melted brown crayons.
Phase 2: An introduction to sweet drinks
To the surprise of your adolescent taste buds, a taste of your mother's Starbucks unlocks a category of coffee drinks that taste less like coloring books and more like dessert. Thanks to the syrups, whipped cream, and bonus sugar that you can actually add yourself (!), caramel macchiatos and Frappuccinos become potent rewards any time you are dragged along on a kid's worst nightmare (“errands”).
Phase 3: Own your own coffee maker
Right around when you graduate from high school, or a year before if your family situation warrants thousands of dollars of therapy, you'll receive a hand-me-down drip machine with a grizzled glass pot and chambers growing nascent forms of penicillin. The cheapest canned grounds on the shelf will be your sludge of choice, drank purely to help you wake up or avoid going to sleep.