Santiago Valdez appeals from the 360-month sentence imposed following his guilty plea conviction for conspiracy to distribute more than 500 grams of cocaine. He argues that his sentence, which was enhanced pursuant to U.S.S.G. § 4B1.1 based on Valdez’s status as a career offender, violates the Eighth Amendment because it was cruel and unusual punishment, disproportionate to his offense, and essentially amounted to a life sentence based on his age. Valdez has not shown that his sentence is grossly disproportion *533 ate to the crime. He committed the in.stant offense after two prior felony convictions; was sentenced as a recidivist; was held responsible in the instant case for heroin, cocaine, and cocaine base equivalent to 8,517.57 kilograms of marijuana; and has failed to set forth any cogent argument regarding the disproportionality of his sentence. See Rummel v. Estelle, 445 U.S. 263, 284-85, 100 S.Ct. 1133, 63 L.Ed.2d 382 (1980).

AFFIRMED.