This is a single-arm prospective study, investigating the feasibility, usability, and safety of a wearable bioimpedance sensor in elderly individuals. The sensor is applied on the upper back of the subject, and will be replaced once weekly. The study will include four phases, each interspersed by an interim analysis. Each phase will have a duration of four weeks.

Inclusion Criteria:

• Age ≥ 60 years

Exclusion Criteria:

• Known allergies or skin sensitivities to electrode hydrogel and/or acrylic-based adhesives
• Non-intact skin such as skin breakdown where the device is to be placed (upper back)
• Implantable pulse generators such as pacemakers and defibrillators
• Any medical or psychiatric condition, which in the opinion of the investigator precludes participation