If Owlette, Gekko, and Catboy were all grown-up in "PJ Masks," they would likely have mastered their superhero powers and become even more formidable crime-fighters. They would have honed their teamwork and strategy skills over the years, making them a well-oiled machine when it comes to taking down villains. Additionally, they may have established their own superhero headquarters and taken on more advanced missions to protect their city. With age and experience on their side, they would be able to handle any challenge that comes their way with ease and confidence.