diff --git a/crates/relicario-cli/src/helpers.rs b/crates/relicario-cli/src/helpers.rs
index a864f95..2e7b43b 100644
--- a/crates/relicario-cli/src/helpers.rs
+++ b/crates/relicario-cli/src/helpers.rs
@@ -118,4 +118,21 @@ mod tests {
         // 2026-04-19T00:00:00Z = 1776556800
         assert_eq!(iso8601(1_776_556_800), "2026-04-19T00:00:00Z");
     }
+
+    #[test]
+    fn humanize_age_buckets() {
+        assert_eq!(humanize_age(0), "just now");
+        assert_eq!(humanize_age(59), "just now");
+        assert_eq!(humanize_age(60), "1 minute ago");
+        assert_eq!(humanize_age(120), "2 minutes ago");
+        assert_eq!(humanize_age(3_599), "59 minutes ago");
+        assert_eq!(humanize_age(3_600), "1 hour ago");
+        assert_eq!(humanize_age(7_200), "2 hours ago");
+        assert_eq!(humanize_age(86_400), "1 day ago");
+        assert_eq!(humanize_age(86_400 * 2), "2 days ago");
+        assert_eq!(humanize_age(86_400 * 30), "1 month ago");
+        assert_eq!(humanize_age(86_400 * 60), "2 months ago");
+        assert_eq!(humanize_age(86_400 * 365), "1 year ago");
+        assert_eq!(humanize_age(86_400 * 365 * 3), "3 years ago");
+    }
 }