alertMemberAge.component.html

<div ng-repeat="alert in $ctrl.alerts">
  <div>{{alert.message}}</div>
</div>

alertMemberAge.component.js

angular.module('vic.surveys').component('alert', {
    templateUrl: '...',
    binding: {
      member:'<'
    },
    controller: ['_',function (_) {
        let $ctrl = this;
        $ctrl.$onChanges = () => {
          $ctrl.alerts = _(memberAlertService.age)
            .map(func => func($ctrl.member))
            .filter(err => err)
            .value();
        }
    }]
});

memberAlert.service.js

angular.module('vic.surveys').factory('memberAlertService', {
    function rule1() {
    }

    function rule2() {
    }
    
    return {
      age: {
        rule1,
        rule2
      }
    }
});

memberForm.html

<input type="number" ng-model="member.age"/>
<alert-member-age></alert-member-age>