To adjust the WordPress query to only retrieve posts not older then 2 months use the following query:

// Calculate the date for one month ago
        $two_months_ago = date('Y-m-d H:i:s', strtotime('-2 months', strtotime($current_date)));

        $args = array(
            'post_type' => 'post',
            'posts_per_page' => -1,
            'numberposts' => -1,
            'post_status' => 'publish',
            'date_query' => [
                'after' => $two_months_ago,
                'column' => 'post_modified'// Retrieve posts after one month ago
            ],
        );