I wonder if this had anything to do with it:
Trump gets Barron's age wrong when asked about his youngest son's convention roleFormer President Donald Trump misstated the age of his youngest son in an interview that aired Thursday, saying Barron Trump was 17 years old — even though he turned 18 in March.
The mistake came when Trump reacted to his son's entering the political arena as a delegate from Florida for the Republican National Convention, which was first reported by NBC News.
"He’s pretty young, I will say. He’s 17," Trump said in an interview with Telemundo 51 of Miami. "But if they can do that, I’m all for it."