Older adults are the most rapidly increasing age group globally. 1 55% to 95% of older adults are categorized as multimorbid, and the prevalence is increasing with age. 2 Thus, older adults tend to receive more medical treatment compared to younger people. 3 Treatment guidelines are primarily based on data from randomized clinical trials (RCTs) 4 that tend to some extent to exclude older adults. The insufficient inclusion of older adults is reflected by a lower external validity in RCTs, where the average age, level of function, comorbidities and number of prescribed drugs do not reflect the target population. 5 Using data from RCTs not including older adults sufficiently is problematic since the age-related physiological changes are not taken into account. 6 For instance,