Donald Trump , who once bragged of having one of the great memories of all time, forgot the age of his youngest child this week.

Barron Trump is about to emerge on the political stage as a delegate from Florida at this summers Republican National Convention.

To me thats very cute, because hes a very young guy, the former president told Miamis Telemundo 51 on Thursday, praising Barron as a good student.

Hes pretty young, I will say, Trump said. Hes 17.

Just one problem: Barron Trump is actually 18. His birthday was in March.

When NBC News pointed out the error to the Trump campaign, a spokesperson called it tabloid journalism fit for the checkout aisle of a grocery store.

Barron Trump has largely remained out of the public eye during his fathers presidency and in the years since. Thats set to change this summer: The New York Times said Barron will officially nominate his father as the Republican presidential candidate at the convention, slated to be held in Milwaukee in July.

Barron is set to graduate from high school next week.