diff --git a/tildes/static/js/behaviors/comment-reply-button.js b/tildes/static/js/behaviors/comment-reply-button.js
index 0f94ad4..f2f9e3f 100644
--- a/tildes/static/js/behaviors/comment-reply-button.js
+++ b/tildes/static/js/behaviors/comment-reply-button.js
@@ -79,6 +79,20 @@ $.onmount("[data-js-comment-reply-button]", function() {
             }
         }
 
+        var originalCommentTimestamp = new Date(
+            $parentComment
+                .find(".comment-posted-time")
+                .first()
+                .attr("datetime")
+        );
+        if (Date.now() - originalCommentTimestamp > 1000 * 3600 * 24 * 62) {
+            var warningDiv = document.createElement("div");
+            warningDiv.classList.add("toast", "toast-minor", "toast-warning");
+            warningDiv.innerHTML =
+                "The comment you're replying to is over two months old. Are you sure you want to continue?";
+            clone.querySelector("form").prepend(warningDiv);
+        }
+
         // update Intercooler so it knows about this new form
         Intercooler.processNodes(clone);
 
diff --git a/tildes/tildes/templates/topic.jinja2 b/tildes/tildes/templates/topic.jinja2
index 73c4697..bf04481 100644
--- a/tildes/tildes/templates/topic.jinja2
+++ b/tildes/tildes/templates/topic.jinja2
@@ -213,6 +213,9 @@
       data-js-prevent-double-submit
       data-js-confirm-leave-page-unsaved
     >
+      {% if old_topic_warning %}
+      <div class="toast toast-minor toast-warning">The topic you're replying to is over two months old. Are you sure you want to continue?</div>
+      {% endif %}
       <input type="hidden" name="csrf_token" value="{{ get_csrf_token() }}">
 
       {{ markdown_textarea() }}
diff --git a/tildes/tildes/views/topic.py b/tildes/tildes/views/topic.py
index 7afe9f2..00efc16 100644
--- a/tildes/tildes/views/topic.py
+++ b/tildes/tildes/views/topic.py
@@ -6,6 +6,7 @@
 from collections import namedtuple
 from typing import Any, Optional, Union
 
+from datetime import timedelta
 from marshmallow import missing, ValidationError
 from marshmallow.fields import Boolean, String
 from pyramid.httpexceptions import HTTPFound
@@ -27,7 +28,7 @@ from tildes.enums import (
     TopicSortOption,
 )
 from tildes.lib.database import ArrayOfLtree
-from tildes.lib.datetime import SimpleHoursPeriod
+from tildes.lib.datetime import SimpleHoursPeriod, utc_now
 from tildes.models.comment import Comment, CommentNotification, CommentTree
 from tildes.models.group import Group, GroupWikiPage
 from tildes.models.log import LogComment, LogTopic
@@ -374,6 +375,11 @@ def get_topic(request: Request, comment_order: CommentTreeSortOption) -> dict:
             tree.uncollapse_new_comments(topic.last_visit_time)
             tree.finalize_collapsing_maximized()
 
+    old_topic_warning = False
+
+    if utc_now() - topic.created_time > timedelta(days=62):
+        old_topic_warning = True
+
     return {
         "topic": topic,
         "log": log,
@@ -381,6 +387,7 @@ def get_topic(request: Request, comment_order: CommentTreeSortOption) -> dict:
         "comment_order": comment_order,
         "comment_order_options": CommentTreeSortOption,
         "comment_label_options": CommentLabelOption,
+        "old_topic_warning": old_topic_warning,
     }