diff --git a/scripts/last30days.py b/scripts/last30days.py
index 2a998eb..5adb89e 100644
--- a/scripts/last30days.py
+++ b/scripts/last30days.py
@@ -236,11 +236,13 @@ def main():
     progress = ui.ProgressDisplay(args.topic, show_banner=True)
 
     if not args.refresh and not args.mock:
-        cached = cache.load_cache(cache_key)
+        cached, cache_age = cache.load_cache_with_age(cache_key)
         if cached:
             # Use cached data
-            progress.show_cached()
+            progress.show_cached(cache_age)
             report = schema.Report.from_dict(cached)
+            report.from_cache = True
+            report.cache_age_hours = cache_age
             output_result(report, args.emit)
             return
 
diff --git a/scripts/lib/cache.py b/scripts/lib/cache.py
index 0545ba6..0a6ac7b 100644
--- a/scripts/lib/cache.py
+++ b/scripts/lib/cache.py
@@ -57,6 +57,39 @@ def load_cache(cache_key: str, ttl_hours: int = DEFAULT_TTL_HOURS) -> Optional[d
         return None
 
 
+def get_cache_age_hours(cache_path: Path) -> Optional[float]:
+    """Get age of cache file in hours."""
+    if not cache_path.exists():
+        return None
+    try:
+        stat = cache_path.stat()
+        mtime = datetime.fromtimestamp(stat.st_mtime, tz=timezone.utc)
+        now = datetime.now(timezone.utc)
+        return (now - mtime).total_seconds() / 3600
+    except OSError:
+        return None
+
+
+def load_cache_with_age(cache_key: str, ttl_hours: int = DEFAULT_TTL_HOURS) -> tuple:
+    """Load data from cache with age info.
+
+    Returns:
+        Tuple of (data, age_hours) or (None, None) if invalid
+    """
+    cache_path = get_cache_path(cache_key)
+
+    if not is_cache_valid(cache_path, ttl_hours):
+        return None, None
+
+    age = get_cache_age_hours(cache_path)
+
+    try:
+        with open(cache_path, 'r') as f:
+            return json.load(f), age
+    except (json.JSONDecodeError, OSError):
+        return None, None
+
+
 def save_cache(cache_key: str, data: dict):
     """Save data to cache."""
     ensure_cache_dir()
diff --git a/scripts/lib/render.py b/scripts/lib/render.py
index 14c8149..7a7a83f 100644
--- a/scripts/lib/render.py
+++ b/scripts/lib/render.py
@@ -29,6 +29,13 @@ def render_compact(report: schema.Report, limit: int = 15) -> str:
     # Header
     lines.append(f"## Research Results: {report.topic}")
     lines.append("")
+
+    # Cache indicator
+    if report.from_cache:
+        age_str = f"{report.cache_age_hours:.1f}h old" if report.cache_age_hours else "cached"
+        lines.append(f"**⚡ CACHED RESULTS** ({age_str}) - use `--refresh` for fresh data")
+        lines.append("")
+
     lines.append(f"**Date Range:** {report.range_from} to {report.range_to}")
     lines.append(f"**Mode:** {report.mode}")
     if report.openai_model_used:
diff --git a/scripts/lib/schema.py b/scripts/lib/schema.py
index 2adfc4d..9b84414 100644
--- a/scripts/lib/schema.py
+++ b/scripts/lib/schema.py
@@ -156,6 +156,9 @@ class Report:
     # Status tracking
     reddit_error: Optional[str] = None
     x_error: Optional[str] = None
+    # Cache info
+    from_cache: bool = False
+    cache_age_hours: Optional[float] = None
 
     def to_dict(self) -> Dict[str, Any]:
         d = {
@@ -178,6 +181,10 @@ class Report:
             d['reddit_error'] = self.reddit_error
         if self.x_error:
             d['x_error'] = self.x_error
+        if self.from_cache:
+            d['from_cache'] = self.from_cache
+        if self.cache_age_hours is not None:
+            d['cache_age_hours'] = self.cache_age_hours
         return d
 
     @classmethod
@@ -248,6 +255,8 @@ class Report:
             context_snippet_md=data.get('context_snippet_md', ''),
             reddit_error=data.get('reddit_error'),
             x_error=data.get('x_error'),
+            from_cache=data.get('from_cache', False),
+            cache_age_hours=data.get('cache_age_hours'),
         )
 
 
diff --git a/scripts/lib/ui.py b/scripts/lib/ui.py
index a08f6ca..f2d93c3 100644
--- a/scripts/lib/ui.py
+++ b/scripts/lib/ui.py
@@ -177,8 +177,12 @@ class ProgressDisplay:
         sys.stderr.write(f"{Colors.CYAN}X:{Colors.RESET} {x_count} posts\n\n")
         sys.stderr.flush()
 
-    def show_cached(self):
-        sys.stderr.write(f"{Colors.GREEN}⚡{Colors.RESET} {Colors.DIM}Using cached results{Colors.RESET}\n\n")
+    def show_cached(self, age_hours: float = None):
+        if age_hours is not None:
+            age_str = f" ({age_hours:.1f}h old)"
+        else:
+            age_str = ""
+        sys.stderr.write(f"{Colors.GREEN}⚡{Colors.RESET} {Colors.DIM}Using cached results{age_str} - use --refresh for fresh data{Colors.RESET}\n\n")
         sys.stderr.flush()
 
     def show_error(self, message: str):