JS – why is it printing?

let raceNumber = Math.floor(Math.random() * 1000);

const earlyRegister = true;
let runnersAge = 16;

if (runnersAge > 18 && earlyRegister) {
  raceNumber += 1000;
}

if (runnersAge > 18 && earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 9.30 am.`);
} else if (runnersAge > 18 && !earlyRegister) {
  console.log(`Hello, runner number ${raceNumber}. You're start time is 11.00 am.`);
} else if (runnersAge < 18)
  console.log(`Hello, runner number ${raceNumber}. You're start time is 12.30 am.`);
  else (runnersAge === 18)
  console.log(`Hello! Since you're 18, please see the registration desk.`);