Shikoku, often called Japan's "Grandpa Island" due to its aging population, faces significant demographic challenges that many rural areas in Japan and around the world are experiencing. The island's population decline is driven primarily by low birth rates and the migration of younger people to urban centers like Osaka and Tokyo for better education and job opportunities. From personal observations and local stories, many towns on Shikoku struggle to sustain their communities as younger generations seek livelihoods elsewhere. This results in a higher proportion of elderly residents, leading to a reduced workforce and difficulties in maintaining local services. The term "Grandpa Island" reflects not only the elderly's significant presence but also underscores the pressures on social welfare and healthcare systems. While the region is rich in cultural heritage and natural beauty, economic stagnation hinders revitalization efforts. Interestingly, some local initiatives have emerged to counteract this decline. These include promoting tourism focused on traditional festivals and nature, encouraging younger people to return through startup incentives, and developing technology-driven agriculture for sustainable local economies. Understanding Shikoku’s situation offers a glimpse into broader issues of demographic change faced by many industrialized countries. It highlights the importance of addressing rural depopulation with innovative policies that balance economic growth and social support for aging communities.