Miley Cyrus says she isn't sure if she wants to have kids.Axelle/Bauer-Griffin/FilmMagicMiley Cyrus doesn't know if she ever wants to be a mom."I'm 31 now, and I still don't know if I want kids or not," she told W Magazine.And it's not just her: More and more Americans aren't interested in having kids.Miley Cyrus isn't sure if she ever wants to have children.In an interview with W Magazine published on June 3, the "Flowers" singer opened up about growing older and being comfortable with herself."I love being an adult," Cyrus told W Magazine.