On Wednesday, a Louisville-based independent insurance agency will turn 100 years old. Van Zandt, Emrich & Cary Inc. will celebrate its 100th anniversary March 19. The insurance provider employs 50 professionals, serves more than 6,000 businesses and individuals and generates annual premiums in excess of $50 million, according to a news release from the company. “As an independent insurance agency, we have the flexibility to create customized, creative, cost-effective solutions for clients,”…