Jan. 20, 2017 6:11 AM PT7:11 AM MT8:11 AM CT9:11 AM ET14:11 GMT10:11 PM 北京时间7:11 AM MST9:11 AM EST8:11 AM CT18:11 UAE9:11 ETNaN:� - Orr is retiring from the NFL at age 24 because of a serious injury. Orr becomes the latest player to cite long-term health when cutting short a promising career. Analysis: Orr missed Week 17 with a neck injury but emerged as a starter in 2016 and was expected to have a new contract in place for next season. Chris Borland, a third-round pick in 2014, retired from the San Francisco 49ers after a standout rookie season because of concussion concerns. The same offseason, Pro Bowl linebacker Patrick Willis retired from the 49ers at age 30.