Whether Whitener, a beer vendor, could continue the case and assert the equal-protection rights of males ages 18 to 20 after Craig's claim became moot.
Holding
Yes. Craig's claim was moot, but Whitener had Article III standing and could assert the rights of her prospective male customers.
Reasoning
Craig's request for prospective declaratory and injunctive relief became moot when he reached age 21. Whitener, however, remained directly subject to the challenged law: she had to forgo sales to 18-to-20-year-old men and lose business, or violate the statute and risk penalties and loss of her license. That direct economic and regulatory injury gave her a concrete stake in the controversy.
The Court treated the restriction on third-party standing as a prudential rule rather than a constitutional bar. The constitutional issue had already been fully litigated, Oklahoma had not objected to Whitener's standing below, and refusing to decide the case would only require repetitive litigation by another young man whose claim might likewise expire when he turned 21.
Whitener was also an appropriate advocate for the affected purchasers. Because the statute regulated sales rather than drinking or possession, vendors were the most natural parties to challenge its enforcement. Enforcing the law against Whitener would directly impair young men's ability to purchase beer, just as enforcement against a distributor in Eisenstadt v. Baird impaired third parties' access to contraceptives.