Pilot testing cognitive stimulation intervention on older adults' cognitive function, cognitive self-efficacy, and sense of happiness

•Cognitive stimulation intervention (CSI) is an effective intervention for improving cognitive function, cognitive self-efficacy, and sense of happiness in older adults attending seniors' clubs.•CSI generated a significant improvement on older adults' cognitive function, in comparison to their cognitive status at baseline.•CSI significantly increased cognitive self-efficacy and sense of happiness in older adults.•The effects of CSI were sustained at 6 months post-intervention for cognitive function and cognitive self-efficacy, but not for sense of happiness. With the ageing population increasing worldwide, identifying effective approaches to counteract cognitive decline becomes significant for maintaining cognitive health and quality of life in older adults. The lack of cognitive activity accelerates age cognitive decline. Cognitive stimulation interventions can maintain older adults’ cognitive reserve, enhance their feelings of happiness, and potentially improve their psychosocial wellbeing. This study aimed to determine the impact of Cognitive Stimulation Intervention on older adults' cognitive function, cognitive self-efficacy, and sense of happiness. A quasi-experimental methodological approach was applied. Two seniors' clubs were the sites for recruitment in this study as part of the Alexandria Governorate's Ministry of Social Solidarity, Egypt. Eighty older adults (aged 60 and above), randomly assigned into two equal groups. The study group received the study intervention, and the control group received regular seniors’ club services. Cognitive function, cognitive self-efficacy, and sense of happiness scores among the study group, were significantly increased from (22.40 ± 0.67, 54.51 ± 8.63 and 27.68 ± 14.0 respectively) to (24.30 ± 1.07, 87.84 ± 4.96 and 65.98 ± 8.90 respectively) (P < 0.001) following the interventions, and were significantly higher than the control group's post-test percent scores (22.08 ± 0.98, 54.35 ± 6.97, and 28.75 ± 9.60 respectively) (P < 0.001). Cognitive Stimulation Intervention effectively fostered the older adults’ cognitive function, cognitive self-efficacy, and sense of happiness. Consequently, seniors' clubs, care homes, and other contexts seeking to apply Cognitive Stimulation Intervention to improve older adults' cognitive function, and general wellbeing must embed this intervention as part of their routine care and social activities programs.