Background Older adults living with multiple long-term conditions (MLTC, also known as multimorbidity) and frailty are more likely to experience a deterioration in their health requiring specialist referral or hospital admission than individuals without these syndromes. However, this group of older people are underserved by research meaning that there is a limited evidence base for their care. This study therefore aimed 1) to determine if it is feasible to recruit and collect quantitative data to describe the health and lifestyle of older adults living with MLTC, frailty and a recent deterioration in health and 2) to assess if taking part in research is acceptable to this group of older adults.Methods Participants were approached and recruited for this study via an Older People’s Medicine Day Unit in Newcastle upon Tyne, UK. The study took a mixed methods approach, involving quantitative and qualitative data collection. To determine the feasibility of carrying out research in this group, we quantified recruitment rate and collected data on the health and lifestyle, including diet and physical activity, of the participants. Qualitative semi-structured interviews were undertaken to assess acceptability. Two separate interviews were carried out focusing on involving older adults in research and the participants’ experiences of taking part in the research. Interviews were analysed using thematic analysis.Results Fifty patients were approached to participate in the study with twenty-nine (58%) successfully recruited. It was feasible to collect information to describe the health and lifestyle of these older adults who demonstrated very low levels of physical activity. Participants reported that taking part in the research was acceptable to them with interview analysis generating three themes 1) developing a meaningful partnership, 2) enabling factors to participation: research at home with flexible delivery and 3) social and psychological benefits of research participation.Conclusions It is feasible and acceptable to recruit and carry out research with this underserved group of older adults. Participants found taking part in this research to be acceptable and reported overall positive experiences of their involvement in the study and indicated that they would be willing to contribute to further research in the future.