diff --git a/src/utils/math.ts b/src/utils/math.ts
index 37a35a0..06a5b6e 100644
--- a/src/utils/math.ts
+++ b/src/utils/math.ts
@@ -1,4 +1,6 @@
 export function calculateAge(birthDate: Date) {
+    birthDate.setMonth(birthDate.getMonth() - 1);
+
     let today = new Date();
     let years = today.getFullYear() - birthDate.getFullYear();
     let months = today.getMonth() - birthDate.getMonth();