“…In four studies (16%), the participants had a mean age of 66–70 (e.g., Karel et al, 2000; Slaymaker & Owen, 2008), in two studies (8%), the mean age was 71–75 (D'Agostino et al, 2006; Schutte et al, 2009), in one study (4%), the participants were 76 and over (Lewis et al, 2017) and one study (4%) examined two groups of participants where the mean age of one group was 60–65 (early onset) and the other group was aged 66–70 (late onset) (Emiliussen et al, 2019). Three studies (12%) examined a population aged 55 and older (Lemke & Moos, 2003a; 2003b; 2002), and one (4%) examined a sample aged 60 and older (Mosher-Ashley & Rabon, 2001). In terms of the participants’ gender, most studies primarily examined males: five studies (20%) were composed of 100% males (e.g., Karel et al, 2000; Lemke & Moos, 2002), 16 studies (64%) included a majority of males (e.g., Emiliussen et al, 2019; Munro et al, 2000), one (4%) included only females (Ermann et al, 2016), two studies (8%) included a majority of females (D'Agostino et al, 2006; Mosher-Ashley & Rabon, 2001) and one (4%) study included three groups of participants (both male and female) of which two had majority of females (Oslin et al, 2009).…”