Cite as: 512 U. S. 967 (1994)
Opinion of the Court
constitute a continuing threat to society." See Jurek, 428 U. S., at 269. Both a backward-looking and a forward-looking inquiry are a permissible part of the sentencing process, however, and the States have considerable latitude in determining how to guide the sentencer's decision in this respect. Here, factor (b) is not vague.
Tuilaepa's third challenge is to factor (i), which requires the sentencer to consider "[t]he age of the defendant at the time of the crime." This again is an unusual challenge in light of our precedents. See Eddings v. Oklahoma, 455 U. S. 104, 115-117 (1982) (age may be relevant factor in sentencing decision). The factual inquiry is of the most rudimentary sort, and there is no suggestion that the term "age" is vague. Petitioner contends, however, that the age factor is equivocal and that in the typical case the prosecution argues in favor of the death penalty based on the defendant's age, no matter how old or young he was at the time of the crime. It is neither surprising nor remarkable that the relevance of the defendant's age can pose a dilemma for the sentencer. But difficulty in application is not equivalent to vagueness. Both the prosecution and the defense may present valid arguments as to the significance of the defendant's age in a particular case. Competing arguments by adversary parties bring perspective to a problem, and thus serve to promote a more reasoned decision, providing guidance as to a factor jurors most likely would discuss in any event. We find no constitutional deficiency in factor (i).
C
Petitioners could not and do not take great issue with the conclusion that factors (a), (b), and (i) provide common and understandable terms to the sentencer. Cf. Godfrey, 446 U. S., at 429 ("jury's interpretation of [outrageously or wantonly vile, horrible and inhuman factor] can only be the subject of sheer speculation"). Petitioners argue, however, that selection factors must meet the requirements for eligibility
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