Luke Lilledahl, Zack Ryder, and Josh Barr all won medals.
The Nittany Lions will face Iowa, Michigan, Michigan State, and Maryland, Nebraska, Illinois, Ohio State, and Rutgers.
Penn State has received eight-figure donations for eight weeks in a row.
Retherford is one of six wrestlers to ever win the Hodge Trophy multiple times.
The third-year starter has registered 105 tackles, 11 sacks, 10 passes defended, three forced fumbles, and an interception in his Penn State career.
Penn State has three affiliated wrestlers heading to the 2024 Paris Games along side a fourth wrester who will battle for representation in May.