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This summer, at dinner with her best friend, Jacki Barden raised an uncomfortable topic: the possibility that she might die alone. “I have no children, no husband, no siblings,” Barden remembered saying. “Who’s going to hold my hand while I die?” Barden, 75, never had children. She’s lived on her own in western Massachusetts since her husband passed away in 2003. “You hit a point in your life…