const sortedCompanies  = companies.sort(function(c1, c2) {
   if(c1.start > c2.start) {
     return 1;
   } else {
    return -1;
   }
 });

 const sortedCompanies = companies.sort((a, b) => (a.start > b.start ? 1 : -1));

// Sort ages
 const sortAges = ages.sort((a, b) => a - b);