nodequest1.js

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

console.log('What\'s your age ? ')
process.stdin.on('data', (value) => {
    const age = parseInt(value, 10);
    if (isNaN(age)) {
        console.error("Value is not a number")
    } else if (age < 0 || age > 99) {
        console.error("Illegal value")
    } else {
        let year = new Date().getFullYear() - age - 1;
        console.log('Your birth year is probably ' + year)
    }
    process.exit()
})