Material gerontology poses the question of how aging processes are co-constituted in relation to different forms of (human and non-human) materiality. This paper makes a novel contribution by asking when aging processes are co-constituted and how these temporalities of aging are entangled with different forms of materiality. In this paper, we explore the entanglements of temporality and materiality in shaping later life by framing them as spacetimematters (Barad, 2013). By drawing on empirical examples from data from a qualitative case study in a long-term care (LTC) facility, we ask how the entanglement of materiality and temporality of a fall-detection sensor co-constitutes aging. We focus on two types of material temporality that came to matter in age-boundary-making practices at this site: the material temporality of a technology-in-training and the material temporality of (false) alarms. Both are interwoven, produced and reproduced through spacetimematterings that established age-boundaries. Against the backdrop of these findings, we propose to understand age(ing) as a situated, distributed, more-than-human process of practices: It emerges in an assemblage of technological innovation discourses, problematizations of demographic change, digitized and analog practices of care and caring, bodily functioning, daily routines, institutionalized spaces and much more. Finally, we discuss the role power plays in those spacetimematterings of aging and conclude with a research outlook for material gerontology.

物质老年学提出了衰老过程如何与不同形式（人类和非人类）物质性相关的共同构成的问题。本文做出了新颖的贡献，提出了衰老过程何时共同构成以及这些衰老的时间性如何与不同形式的物质性纠缠在一起的问题。在本文中，我们通过将时间性和物质性视为时空问题来探讨塑造晚年生活的时间性和物质性的纠缠（Barad，2013）。通过借鉴长期护理 (LTC) 机构定性案例研究数据中的经验示例，我们询问跌倒检测传感器的物质性和时间性的纠缠如何共同构成衰老。我们重点关注在本网站的年龄边界制定实践中发挥重要作用的两种类型的物质暂时性：训练中的技术的物质暂时性和（错误）警报的物质暂时性。两者都是通过建立年龄界限的时空事物交织、产生和复制的。在这些发现的背景下，我们建议将老龄化理解为一种情境化、分布式、超越人类的实践过程：它出现在技术创新话语、人口变化问题、数字化和模拟实践的集合中。照顾和关怀、身体机能、日常生活、制度化空间等等。最后，我们讨论了权力在衰老的时空问题中所扮演的角色，并总结了材料老年学的研究前景。