**2. Methodology**

We searched for publications dated between January 2015 and January 2020 (see **Table 2**) using keywords and medical subject headings termed as psychology of frailty in the elderly. We searched PubMed, Medline and Google Scholar database.

**Figure 1** shows the flow chart selection process. From the 1648 papers initially selected, 20 were found suitable to be included in the present review (**Table 3**).

#### **2.1 Possible limits of the review**

Some possible limits of this narrative review can be found in the low prevalence of randomized clinical trial that has investigated classical or innovative psychological intervention for the frailty in elderly people.
