The volume aims to explore the intersections between celebrity, ageing, and post-career, offering a perspective - anchored in the frameworks of celebrity studies and media studies - that encompasses both sports stars and entertainment industry figures. It investigates how celebrity capital is negotiated and renegotiated over time, in light of changes affecting the body, identity, and public image, as well as media practices of representation and self-representation. The ageing process, far from being a mere biological trajectory, takes on cultural, symbolic, and performative meanings that challenge how celebrities are perceived, narrated, and repositioned in the public sphere. While some figures manage to capitalize on their visibility through rebranding strategies, entrepreneurial ventures, political engagement, or new roles in the media system (mentorship, hosting, content creation) - sometimes distancing themselves from their original fields or reinventing themselves within them - others experience forms of decentering or obsolescence that undermine the sustainability of their capital over time.