Abstract
Essentially, intergenerational relationships
should seamlessly continue while gradually
changing its targets and forms.
The purpose of this manuscript is to review
the outcomes and future prospects of
intergenerational studies in accordance with one’s
life course. Based on productivity theory, we have
operationally defined social participation and
social contribution as five stages: (1) employment;
(2) volunteer activity; (3) self-development: hobby,
lifelong education, and health promotion; (4)
informal communication with friends or
neighbors; (5) care service usage. In fact, as it is
difficult for the elderly to shift to the next stage
smoothly, some elderlies become socially isolated
or homebound. One major reason may be because
we have not established an adequate system to
support seamless shift from a higher stage to a
lower stage for the elderly with declining
functional capacity. Therefore, the support system
is required in the Integrated Care System in
Japan.
https://ror.org/03rd0p893 
