Clint graduated from Provo High School in 1981 and attended Utah Technical College, Provo/Orem, where he excelled in live dramatic arts. For most of his life, he lived in Heber Valley and trained wolves and bears for movies as well as television programs and commercials.
He had a daughter, Faith Lynne (born 1999), a son William Cash (born 2001) and a step-daughter, Alex, with his wife, Kristi. He also had a son, Clinton D. who died on 30 June 1996.
Youngreen passed away one year prior to the premiere of Zookeeper (2011). He trained both the bear and wolf in that cinematic production.