Young did all of his scoring in the second half for the 76ers, who secured the Eastern Conference's eighth and final playoff spot after a lengthy delay in clinching.
The victory gave Philadelphia its first three-game winning streak since March and assured the Sixers their first winning season since 2004-05.
The Nets fell in their final home game in New Jersey. The franchise is scheduled to begin play next season at its new home in Brooklyn.
They turned in a 9-24 home record in their final season at Newark's Prudential Center.
MarShon Brooks scored 18 points and Kris Humphries added 16 points and 12 rebounds for the Nets.
Swim Week Miami Beach 2014 [PHOTOS]