Does the Eighth Amendment, under Miller v. Alabama, require invalidation of respondent's sentence?

QUESTION PRESENTED Respondent received a 67-year non-mandatory sentence 25 years ago, when he was 15 years old, for the murder of an elderly couple. Does the Eighth Amendment, under Miller v. Alabama, 567 U.S. 460 (2012), which applies to mandatory sentences, require invalidation of respondent’s sentence? Petitioner seeks review because this question is also presented in a pending case before this Court— Mathena v. Malvo, 139 S. Ct. 1317 (2019) (No. 18217).