Editor’s Note: This headline has been updated. Donald Trump, who frequently boasts about “ac[ing]” a “tough” cognitive test, “misstated the age of his youngest son” in a Telemundo51 of Miami interview published Thursday, NBC News reports. In the interview, Telemundo’s Marilys Llanos asked Trump about his reaction to Barron Trump, his youngest son, being selected as a Florida delegate to the Republican National Convention. “To me, that’s very cute, because he’s a very young guy and he’s graduating from high school this year,” Trump said. “He’s a very good student, very smart, and I think that’s…