Edit in JSFiddle

var myApp = angular.module('myApp', []);

myApp.controller('fooCtrl', ['$scope', function ($scope) {
    $scope.items = [
        {name: 'mamor', age: 16},
        {name: 'MAMOR', age: 20}
    ];

    $scope.active = function (index, active) {
        $scope.items[index].active = active;
        $scope.items[index].style = active ? {color: 'red'} : {};
    };
}]);

<div ng-app="myApp" ng-controller="fooCtrl">
    <div ng-repeat="(index, item) in items" ng-style="item.style" ng-mouseover="active(index, true)" ng-mouseleave="active(index, false)">
        name: {{ item.name }}
        age: <span ng-show="item.active">{{ item.age }}</span>
    </div>
</div>