COVID-19 Chinese older adults EQ–5D–5L Gallup World Poll New Zealand activities of daily living adolescence ageism bic Book Industry Communication::J Society & social sciences::JM Psychology community home-based elderly care conscientiousness coping strategies developmental age discrimination emotional intelligence exit intention family functioning flow experience gender happiness health interpersonal stressors kindness interventions life satisfaction materialism mediating effect normative stressors nurses physical activity physical well-being