diff --git a/packages/calculator/src/index.ts b/packages/calculator/src/index.ts
index 0515eb1..5272d9c 100644
--- a/packages/calculator/src/index.ts
+++ b/packages/calculator/src/index.ts
@@ -473,7 +473,7 @@ export class Standards {
                     // now that we generated metric data, remove the old data
                     this.standardsData[activity].standards = this.standardsData[
                         activity
-                    ].standards.filter((s) => s.metrics.age);
+                    ].standards.filter((s) => s.metrics.age != null);
                 } else if (generator.metric === "weight") {
                     for (const gender of Object.values(Gender)) {
                         for (const age of this.agesFor(activity, gender)) {