Magento 2 get attribute options by attribute code?

How to get the list of option values for particular attribute code in magento 2?

<?php namespace Sample\Shopbyage\Block;                                                                         use \Magento\Eav\Api\Data\AttributeOptionInterfaceFactory;  class Shopbyage extends \Magento\Catalog\Block\Product\AbstractProduct {      protected $  _productCollectionFactory;        protected $  catalogProductVisibility;     protected $  urlHelper;     protected $  sqlBuilder;     protected $  imageHelperFactory;     protected $  eavEntityFactory;       public function __construct(         \Magento\Catalog\Block\Product\Context $  context,               \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $  productCollectionFactory,         \Magento\Catalog\Model\Product\Visibility $  catalogProductVisibility,          \Magento\Framework\App\Http\Context $  httpContext,         \Magento\Rule\Model\Condition\Sql\Builder $  sqlBuilder,          \Magento\Widget\Helper\Conditions $  conditionsHelper,         \Magento\Catalog\Helper\ImageFactory $  imageHelperFactory,         \Magento\Framework\Url\Helper\Data $  urlHelper,         \Magento\Review\Model\ReviewFactory $  reviewFactory,           array $  data = []     ) {         $  this->_productCollectionFactory = $  productCollectionFactory;           $  this->catalogProductVisibility = $  catalogProductVisibility;         $  this->httpContext = $  httpContext;         $  this->sqlBuilder = $  sqlBuilder;                $  this->urlHelper = $  urlHelper;         $  this->conditionsHelper = $  conditionsHelper;          parent::__construct($  context, $  data);      }      protected function _prepareLayout()     {     }       public function toHtml()     {                return parent::toHtml();     }      public function getShopbyageUrl(){        return $  this->getUrl('shopbyage');     }     public function getProductCollection(){              $  ageValues = $  this->getAge();         $  objectManager   = \Magento\Framework\App\ObjectManager::getInstance();         $  coll = $  objectManager->create('Magento\Catalog\Api\ProductCustomOptionRepositoryInterfaceAttribute $  attributeFactory');         /*$  coll->optionFactory->create();         $  coll->load($  ageValues);         $  attrAll = $  coll->load()->getItems();         foreach($  attrAll as $  st=>$  value){             print_r($  value);         }*/         $  collection = $  this->_productCollectionFactory->create();         $  collection->addAttributeToSelect('*');         $  collection->addAttributeToFilter('age',array(5,6));                 return $  collection;      }    } 

I have tried above code but not working.