AUTHOR=Klimczuk Andrzej , Tomczyk Ɓukasz TITLE=Editorial: Perspectives and Theories of Social Innovation for Ageing Population JOURNAL=Frontiers in Sociology VOLUME=5 YEAR=2020 URL=https://www.frontiersin.org/journals/sociology/articles/10.3389/fsoc.2020.00006 DOI=10.3389/fsoc.2020.00006 ISSN=2297-7775