In which of the following scenarios is the speech in question most likely to be protected by the First Amendment?

The state of New Tudor commissions a study which finds that older drivers are significantly more likely to get into car accidents than their younger counterparts. Thus, the state passes a law declaring that, henceforth, every person's divers's license is automatically suspended at age 70. The law provides that a person over age 70 can get back his or her license by passing a special test in eyesight and alertness designed to test for appropriate driving skill. Joe, age 76, files a lawsuit, asking the court to strike down the law because it violates his right to "equal protection." The result of the case will be...