JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.angularjs.org/1.1.5/angular.js"></script>
<body ng-app ng-controller="AppCtrl">
<select ng-model="selectedName" ng-options="item as item for item in name">
    <option value="">Select Name</option>
</select>
<pre>selectedItem: {{selectedName | json}}</pre>

<select ng-model="selectedage" ng-options="item as item for item in age">
    <option ng-if="!selectedage" value="">Select age</option>
</select>
<pre>selectedItem: {{selectedage | json}}</pre>
</body>

JavaScript

function AppCtrl($scope) {

$scope.name = ["Ved", "James", "Doe","Prakash" ];
var age = {Ved :["25"],James :["26"],Doe:["27"],Prakash:["28"]};
    $scope.$watch('selectedName', function(newValue, oldValue) {
      if ( newValue) {
          var name = $scope.selectedName;
      $scope.age = age[name];
    }
  });
}