“…IGP are social service programmes that provide opportunities for the young and older generations to bring about mutual benefits through a variety of activities (Murayama et al., 2014; Yasunaga et al., 2016). IGP can be classified into educational (e.g., reading, mentoring) (Clyne et al., 2013; Sakurai et al., 2016), social engagement (Skropeta et al., 2014), recreational activities (e.g., dance, horticulture, art) (Lin et al., 2017; Teater, 2016) and health promotion (e.g., obesity prevention) (Werner et al., 2012).…”