Also called "What happens when you outgrow your artstyle"

So, I'm 34 and an aspiring iOS app artist. I really enjoy making games. But when I go to design characters and whatnot, I realize that its really hard divorcing myself from the Anime art that I've done for so many years. Honestly, sci-fi and fantasy concept art is what really appeals to me and I've felt like I've lost interest in the whole anime/manga scene. Most of the fans are younger kids and I've felt a bit alienated at conventions. However, that's the art that I'm proficient at. I'm finding it really hard to shift styles. Anybody else ever feel like you've outgrown your art style or finding it hard to shift gears? I'd love to hear some comments or opinions on the matter whether it be advice or your own experience.