Wearable sensors for remote health monitoring have become essential for elderly healthcare and well-being due to increasing life expectancy and aging populations. These systems use non-invasive, wearable sensors, actuators, and modern communication technologies to enable real-time monitoring of physiological signs and activities from a distant facility. This allows healthcare personnel to assess patient health conditions and provide feedback, while enabling patients to remain in their homes instead of expensive healthcare facilities. The paper reviews recent low-cost and non-invasive health and activity monitoring systems, presents a survey on textile-based sensors for wearable systems, and discusses compatibility of communication technologies and future research challenges in remote monitoring systems. The paper also discusses various aspects of wearable health monitoring systems, including cardiovascular monitoring, activity monitoring, body temperature monitoring, and galvanic skin response (GSR) monitoring. Cardiovascular monitoring systems use ECG, HR, and SpO2 sensors to detect heart-related problems. Activity monitoring systems use accelerometers, gyroscopes, and magnetometers to measure physical activities and locomotion, which can be useful in rehabilitation, sports, and fall detection. Body temperature monitoring systems use various non-invasive methods to measure core body temperature, which can reflect health conditions. GSR monitoring systems measure skin conductance, which reflects sympathetic nervous system activity and is useful for assessing stress and emotion. The paper highlights the importance of wearable health monitoring systems in providing affordable, efficient, and user-friendly solutions for elderly healthcare and well-being. It also discusses the challenges and future research directions in remote health monitoring systems, including the need for secure communication channels, low-power consumption, and integration of multiple electronic and MEMS components. The paper concludes with a comparison of various cardiovascular, activity, body temperature, and GSR monitoring systems, highlighting their key features and performance characteristics.Wearable sensors for remote health monitoring have become essential for elderly healthcare and well-being due to increasing life expectancy and aging populations. These systems use non-invasive, wearable sensors, actuators, and modern communication technologies to enable real-time monitoring of physiological signs and activities from a distant facility. This allows healthcare personnel to assess patient health conditions and provide feedback, while enabling patients to remain in their homes instead of expensive healthcare facilities. The paper reviews recent low-cost and non-invasive health and activity monitoring systems, presents a survey on textile-based sensors for wearable systems, and discusses compatibility of communication technologies and future research challenges in remote monitoring systems. The paper also discusses various aspects of wearable health monitoring systems, including cardiovascular monitoring, activity monitoring, body temperature monitoring, and galvanic skin response (GSR) monitoring. Cardiovascular monitoring systems use ECG, HR, and SpO2 sensors to detect heart-related problems. Activity monitoring systems use accelerometers, gyroscopes, and magnetometers to measure physical activities and locomotion, which can be useful in rehabilitation, sports, and fall detection. Body temperature monitoring systems use various non-invasive methods to measure core body temperature, which can reflect health conditions. GSR monitoring systems measure skin conductance, which reflects sympathetic nervous system activity and is useful for assessing stress and emotion. The paper highlights the importance of wearable health monitoring systems in providing affordable, efficient, and user-friendly solutions for elderly healthcare and well-being. It also discusses the challenges and future research directions in remote health monitoring systems, including the need for secure communication channels, low-power consumption, and integration of multiple electronic and MEMS components. The paper concludes with a comparison of various cardiovascular, activity, body temperature, and GSR monitoring systems, highlighting their key features and performance characteristics.