MURPHY, Circuit Judge. Just weeks before he turned eighteen, Johnathan Holt shot and killed a drug dealer on behalf of a dangerous gang. Soon after this murder, Holt himself suffered gun violence that left him paralyzed from the chest down. A federal jury later convicted him of two crimes for the murder. A district court sentenced him to a mandatory term of life in prison. Yet Holt had committed the murder as a juvenile, so this sentence violated the Eighth Amendment under Miller v. Alabama, 567 U.S. 460 (2012). The district court thus granted Holt’s request for relief from his life sentence. It resentenced him to a total of 900 months’ imprisonment.

Holt now raises two general challenges to this new sentence. First, he argues that it still violates the Eighth Amendment both because the district court did not adequately address his youth and because the Bureau of Prisons has not properly treated his paraplegia. But the Supreme Court’s caselaw requires district courts only to consider a defendant’s youth. The district court here did so. Holt also raises his medical-based Eighth Amendment claim in the wrong venue: a criminal appeal challenging his prison sentence rather than a civil suit challenging his medical care. Second, Holt argues that his sentence is procedurally and substantively unreasonable when measured against the requirements in Federal Rule of Criminal Procedure 32 and the sentencing factors in 18 U.S.C. § 3553(a). Yet Holt did not adequately preserve most of his procedural claims. And the court’s lengthy sentence reasonably fit Holt’s brutal crime. We thus affirm.