NodeJS

gistfile1.txt

process.stdin.resume()
process.stdin.setEncoding('utf8')

console.log('How old are you ? ')
process.stdin.on('data', (age) => {
  console.log('You are ' + age.trim() + ' years old ')
  
  if (age > 99){
      console.log('Too old!!')
  } else if (age < 0) {
    console.log('You are from the future!');
  } else if (!Number(age)) {
    console.log('Please enter a number for your age');
  } else {
    var birth = 2019 - age;
    console.log('You were born in ' + birth)
    process.exit()
  }
  
})