YI Advisors | 176 followers on LinkedIn. YI Advisors is the consulting arm of Young Invincibles (YI), a leading national youth advocacy organization. Founded in the summer of 2009 during the debate over health care reform, YI has quickly grown as the leading voice for young people on the issues of health care, higher education, and employment. Using insight gained from young adults focused research and campaigns, YI Advisors offers a wide range of services to mobilize and engage young adults on behalf of clients in both the private and public sector.