After setting a pan on the stove to heat, Chouji cracks eggs into a bowl as he answers.

"I've been here about a month and a half." He frowns, considering the oddities of time in Luceti. "My birthday was just a couple months before I arrived, though. So I shouldn't be eighteen yet, and I was already seventeen before." He's going to keep calling himself seventeen, regardless of the birthday party, because that's certainly truer than the alternative.