How old is Donald Trump? Trump is 69 years old, born on June 14, 1946, which means that next summer he will be reigning in his 70th birthday. Trump grew up as the son of real estate developer Frederick Trump and he had amassed a fortune estimated at $250 to $300 Million. Donald Trump grew up with four other siblings and he worked for his father's firm, Elizabeth Trump & Son, when he was in college. Trump's sister Maryanne is actually a United States federal judge. Trump was born in Queens, New York, and he lived in Jamaica Estates where he attended the private Kew-Forest School in Forest Hills, Queens.