It is notable that global citizenship education has recently gained prominence in Post 2015 context. This study attempted to explore diverse discourses of global citizenship education in theoretical dimension and it also analyzed the current status of global citizenship education as a new global education agenda. Major findings displayed issues and challenges; de-contextualization against local dimension; vague conceptualization of global citizenship education; limitation of transformative pedagogy and learning discourse; indicator development and monitoring issues; a paradigm shift for global citizenship education engaging with lifelong learning. Eventually, this study argues that comprehensive vision and long term road-map should be established to enhance global citizenship education. Lifelong learning approach is crucial to reshape global citizenship education while interacting with life-world context and life experience, which can promote an epistemology of learning to live together.