app.js

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

console.log('What\'s your age ? ')
process.stdin.on('data', (number) => {
    if (number < 99 && number >= 1){
  console.log("votre année de naissance est " + (2019 - number))
  process.exit()
    } else {
        console.log("vous mentez!")
    }
})