This is a subjective list. Just because something isn't on this list doesn't mean it isn't a milestone, and just because you might not have achieved some of these doesn't mean that you're not an adult. I personally have not achieved all of these milestones, and there are some that I probably will never achieve for whatever reason.
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Avg. score: 24 of 41 (59%)
Required scores: 1, 16, 23, 27, 32