President Donald Trump's youngest son is making a rare public appearance at the Ultimate Fighting Championship Freedom 250 event at the White House.Barron Trump, 20, is the president and first lady Melania Trump's only child. Since his father was inaugurated in 2025, Barron Trump has only made one other public appearance at the State of the Union address in February.The inaugural UFC event at the White House coincides with President Trump's 80th birthday. The spectacle of the arena being built on the South Lawn of the White House has been building for weeks. Also at the big event are Donald Trump Jr., his new wife Bettina Trump and the other Trump kids.Who is Barron Trump?Barron Trump is the youngest of President Donald Trump's children and the only child of the president and first lady Melania Trump. He is a student at New York University.The 20-year-old sticks out for his height whenever he does appear at his parents' sides, but he usually stays out of the public eye. His father has still given him credit for helping reach young voters through social media platforms and influencers like streamer Adin Ross."He's incredible young man, we are very proud of him," Melania Trump said on Jan. 29 on FOX Business Network’s "Mornings With Maria." "This time it's very different because he's 19 years old and first time he was 10 years old. He understands politics, he gives advice to his father, we talk about it, so very different."He is also a founding partner of Sollos, a South Florida-based beverage company.How tall is Barron Trump?Barron Trump is at least 6-foot-7, though there are conflicting reports about his height.What is Barron Trump's age?Barron Trump turned 20 years old in March.Contributing: Jennifer Sangalang, USA TODAY NetworkKinsey Crowley is the Trump Connect reporter for the USA TODAY Network. Reach her at KCrowley@usatodayco.com. Follow her on X (Twitter), Threads, Bluesky and TikTok.