```go
package main

import (
	"github.com/go-zero/zero"
	"github.com/go-zero/zero/mvc"
)

// User model
type User struct {
	Name string
	Age  int
}

// UserController is a controller for user
type UserController struct {
	mvc.Controller
}

// GetUser is a handler for getting user
func (c *UserController) GetUser(name string) (User, error) {
	// get user from db
	user := User{
		Name: name,
		Age:  20,
	}
	return user, nil
}

func main() {
	// create a new zero app
	app := zero.New()

	// register user controller
	app.RegisterController(&UserController{})

	// start the server
	app.Run()
}
```