Preparedness for a “silver tsunami” is the focus of a civil grand jury report released last week, titled “Aging in Marin: What’s the Plan?” The report questioned whether the county has done enough to fund social services and develop a financial strategy for a growing contingent of senior citizens. “Marin County is home to more older adults—as a percentage of the population—than any other county in the state,” the jury wrote. “If nothing changes more…