My life's a completed checklist
He has already accomplished everything he has wanted to in his life, and he is only 26. However he keeps it more general than this, after all, he never said whose checklist. Like he told Billboard magazine:
I’m 26. I don’t know what else I could be doing better than this.
The fact that he even has a “life checklist” confirms that he’s a bit OCD/obsessive.
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