let raceNumber = Math.floor(Math.random() * 1000);
let registeredEarly = true;
const age = 18;
if (age > 18 && registeredEarly === true){
  raceNumber += 1000;
};
if (age > 18 && registeredEarly === true){
  console.log(`Race will begin at 9:30, your race number is: ${raceNumber}.`);
} else if (!registeredEarly && age > 18){
  console.log(`Race will begin at 11:00, your race number is: ${raceNumber}.`);
} else if (age < 18){
  console.log(`Race will begin at 12:30, your race number is: ${raceNumber}.`);
} else {
  console.log("Please approach the registration desk, thanks!");
};