In a moment when the complexity of aging in America has become its own kind of burden, Costco and SCAN Health Plan have announced a partnership to bring Medicare Advantage insurance directly into the warehouse retail experience. The venture, still awaiting regulatory approval, reflects a growing conviction that seniors deserve healthcare as integrated and trustworthy as the institutions they already rely upon. It is, at its core, a wager that convenience and trust — long the province of commerce — may be the missing ingredients in a healthcare system that has too often left older adults naviga