<?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;
    
}

}

<?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;
        
    }
    
    
    
}