Issues using 'this' in IIFE inside object literals in javascript

Question

I have written a simple school object. I want to calculate the age and store it at the same time. However if I use an IIFE to do this, it seems like this becomes undefined. It works fine if I make it a normal function.

Please help!

const date = new Date();
const currentYear = date.getFullYear();

let school = {
  name: "International Public School",
  yoe: 1970,
  age: (function() {
    return currentYear - this.yoe;
  })()
};
console.log(school);

Also can someone tell me how to achieve the same using arrow functions?