There has been vast literature that studies Conversational Agents (CAs) in facilitating older adults' health. The vast and diverse studies warrants a comprehensive review that concludes the main findings and proposes research directions for future studies, while few literature review did it from human-computer interaction (HCI) perspective. In this study, we present a survey of existing studies on CAs for older adults' health. Through a systematic review of 72 papers, this work reviewed previously studied older adults' characteristics and analyzed participants' experiences and expectations of CAs for health. We found that (1) Past research has an increasing interest on chatbots and voice assistants and applied CA as multiple roles in older adults' health. (2) Older adults mainly showed low acceptance CAs for health due to various reasons, such as unstable effects, harm to independence, and privacy concerns. (3) Older adults expect CAs to be able to support multiple functions, to communicate using natural language, to be personalized, and to allow users full control. We also discuss the implications based on the findings.

翻译：已有大量文献研究对话代理在促进老年人健康方面的应用。这些广泛而多样的研究需要一篇综合性综述来总结主要发现并为未来研究提出方向，然而鲜有文献综述从人机交互视角进行探讨。本研究对面向老年人健康的对话代理现有研究进行了系统性综述。通过对72篇论文的系统性梳理，本文回顾了既往研究中关注的老年人特征，并分析了参与者对健康类对话代理的使用体验与期望。研究发现：(1) 既往研究对聊天机器人和语音助手的关注度日益增长，并将对话代理作为多重角色应用于老年人健康领域。(2) 老年人对健康类对话代理的接受度普遍较低，原因包括效果不稳定、损害独立性及隐私顾虑等多重因素。(3) 老年人期望对话代理能支持多功能交互、采用自然语言沟通、实现个性化服务并赋予用户完全控制权。本文最后基于研究发现讨论了相关启示。