Once the epitome of youthful charm and heartthrob allure, a beloved ’90s Hollywood star is now facing an unexpected wave of scrutiny over his aging appearance. Actor Freddie Prinze Jr., one of Hollywood’s iconic ’90s heartthrobs, recently stirred up buzz among fans. His once-familiar face looked noticeably different when he attended a premiere in Beverly Hills, California, in July. At the premiere of “The Girl in the Pool,” Prinze Jr. made a stylish entrance in a black sweater paired with a light pink shirt. Although he looked radiant, his hair showed a noticeable shift from dark gray to a lig…