Is a life imprisonment without parole sentence tantamount to a death sentence for an adult?

reasoning that a life imprisonment without parole sentence for a juvenile is tantamount to a death sentence for an adult. (Miller v. Alabama, supra, 567 U.S. , 132 S.Ct. at p. 24632464.) Because the Eighth Amendment when applied to adults requires individualized sentencing prior to the imposition of a death sentence, the Eighth Amendment when applied to juveniles requires individualized sentencing prior to the imposition of a sentence of life imprisonment without parole. (Ibid. )