diff --git a/index.ts b/index.ts
index 80a085f2f4cffab3ac5965721b346ce8783f5efa..7eb94cb8548d53f2b0bb287fddfc09792be56465 100644
--- a/index.ts
+++ b/index.ts
@@ -1,5 +1,5 @@
 let name0: string = "Alice";
-let age: number = '28';
+let age: number = 28;
 let isActive: boolean = true;
 
 // 函数参数和返回值的类型注释