This research aimed to discover hidden patterns of intergenerational solidarity and digital communication among older parents and adult children during and after the pandemic, examine the transition patterns of solidarity classes between the two-time points, and investigate whether solidarity transition patterns are associated with older parents’ cognitive decline after the pandemic. Using the Korean longitudinal parent–child dyadic data in 2022 (during the pandemic) and 2023 (after the pandemic) studies, 326 older parent-adult child pairs were used in latent class and latent transition analyses. Results of latent class analyses showed that three solidarity classes were identified among older parents and adult child pairs in 2022 and 2023 studies: Tight-knit traditional, living apart-but-digitally connected, and detached. Results of latent transition analysis showed that the majority of parent–child pairs maintained the same latent classes between 2022 and 2023 studies. Furthermore, this study found that older parents who stayed in the tight-knit traditional latent class during and after the pandemic reported lower cognitive decline compared to those who stayed detached latent class between the two-time points. These findings suggest that structural and functional solidarity are likely to be an important factor in alleviating older parents’ cognitive decline. Intergenerational solidarity can be a basis for preventing the onset of Alzheimer’s disease in old age.

本研究旨在发现大流行期间和之后老年父母和成年子女之间代际团结和数字通信的隐藏模式，检查两个时间点之间的团结班级的转变模式，并调查团结转变模式是否与年长父母相关。大流行后认知能力下降。使用 2022 年（大流行期间）和 2023 年（大流行之后）研究中的韩国纵向亲子二元数据，将 326 个年龄较大的父母-成年子女对用于潜在类别和潜在转变分析。潜在阶层分析结果显示，2022 年和 2023 年的研究在年长父母和成年子女之间确定了三个团结阶层：紧密结合的传统阶层、分居但数字化联系的阶层和分离阶层。潜在转变分析结果表明，2022 年至 2023 年研究期间，大多数亲子对保持相同的潜在类别。此外，这项研究发现，与在两个时间点之间保持分离的潜在班级的父母相比，在大流行期间和之后留在紧密联系的传统潜在班级的年长父母的认知能力下降程度较低。这些发现表明，结构和功能的团结可能是缓解年长父母认知能力下降的重要因素。代际团结可以成为预防老年阿尔茨海默病的基础。