public function getAge(): int
    {
        if ($age = $this->response->getHeader('Age')) {
            return (int)$age;
        }
        return max(time() - date('U'), 0);
    }
public function getAge(): int
    {
        if ($age = $this->response->getHeader('Age')) {
            return (int)$age;
        }
        return max(time() - date('U'), 0);
    }
public function getAge ( ) : int { if ( $ age = $ this -> response -> getHeader ( 'Age' ) ) { return ( int ) $ age ; } return max ( time ( ) - date ( 'U' ) , 0 ) ; }
Returns the age of the response

@return integer The age of the response in seconds
Returns the age of the response