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Aaron has chosen to live outside of the spotlight, so little information is known about him. He was born on Oct. 20, 1995, alongside his twin brother. Although their parents were never married, they were in a long-term relationship from 1988 to 1996. Aaron and Julian were just a year old when De Niro and Smith split. (Aaron, Julian, and Elliot De Niro are pictured here in 2007.)