Akira doesn't hear the concern. Only the doubt. It doesn't surprise him; he's used to his honesty being met with disbelief. It does sting a bit, though. Even now.

"Not that insane, surely?" says Joker quietly. "I started my apprenticeship under Mr. Iwai when I was thirteen. A few years later, a merchant captain took an interest in me and bought out the remainder of my indenture. We parted ways when my apprenticeship was over, and the next ship that took me on happened to engage in far less legal forms of trade. It may not have been the straightest path to an occupation, but I assure you, it's far less impressive than it sounds."