Our oldest (about to be 13) has always been pretty good for a kid about eating (i.e. all the kids eat their veggies, don't complain, etc), but now he's becoming more and more adventurous with his eating. I think half of it for him is wanting to be like adults, but the other half is that he's starting to learn that adult food is delicious.
Last time they were here it was his first time eating pesto. Last night my wife made sausage & peppers over zucchini noodles.
He's got a "cookbook for kids" that has a recipe for panko-crusted cod, and that's what he wants to try next.
BTW I know that most of you with kids probably already know this, but a great way to get them to try new things is to have them help make it. Funny how much more willing they are to eat a food if they've helped prepare it. And they're unconsciously biased to say they like it even if they'd have turned up their nose otherwise, because they've got some ownership in the process.