This article has a double aim: it contributes to the emerging paradigm of literary gerontology by borrowing theories from posthumanism and revisits the relation between posthumanism and affect with regard to the lives of older adults. Changanti Tulasi’s short story “Sunstroke” (1977) conceptualizes this relation and illuminates on the one hand, how in the twenty-first century, a gradual deviation towards posthuman social condition challenges the stereotypical portrayals of older adults as ‘nonperson’ and ‘immaterial’ and on the other, problematizes the materiality and beyond-the-human aspect of ageing, calling for an all-inclusive and age-friendly environment. “Sunstroke” foregrounds the entangled life of an aged individual with a non-human material entity or artefact that turns into an external manifestation of the users’ subjectivity. The novelty of the paper lies in its ability to bring out how the short story concedes on these artefacts' agency to create an affective reality for the aged individual thereby clearly bringing the human/nonhuman distinction on the same level of existence. The paper argues that these material entities are not only responsible for ageing realities and experiences, but they are all capable of agency and can co-evolve together, emphasising a more-than-human approach in ageing studies. The novel may be conceived to be a commentary on the emerging discourse in the domain of literary gerontology that aims to cognize the complex interplay between the human and nonhuman world that is transformed into a non-animate subject by the experientialities of the individuals possessing those artefacts. The subjective experientialities relate to the concept of sensitive objects as explored in knowledge domains such as life-course study, material gerontology, and material culture. The paper draws on critical perspectives from posthuman affect and immaterial bodies to contend on the affective experientialities of older adults that emerge as a result of the interaction between humans and non-animate beings.