'Kaitou Kid' has been around for close to twenty years, Kazuha-neechan. Even if he had started as a teenager, he'd be in his late thirties.

If the Kid of eight years ago was the same Kid as today.

...to be fair, Kid doesn't usually let any of those in the task force get close enough to get a good look at him. Of maybe it's just none of them want to admit what might be the truth of the first Kid's disappearance.

But I'm almost positive that the present Kid is early twenties, at best. He might even be younger.