My first application Node.JS

quest.js

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 < 1) {
    console.log ('You have not been born yet')
} else if (!Number(age)) {
    console.log ('That is not a valid age')
} else {
      var year = 2019;
  var birth = year - age;
  console.log('you were born in '+ birth)
}

  process.exit()
})