Gen Z borrowers took the biggest hit of any age group this year, helping pull overall credit scores lower in the worst year for US consumer credit quality since the global financial crisis roiled the world’s economy. The average FICO score slipped to 715 in April from 717 a year earlier, marking the second consecutive year-over-year drop, according to a report released Tuesday by Fair Isaac Corp. The average score dropped three points to 687 in 2009. Most Read from Bloomberg Gen Z borrowers saw the lar ...