input: Write a python function to create a tkinter window with labels and entry boxes for Name and Age, and a Save button.
  assert create_tkinter_window().title() == "User Data Entry"
  assert create_tkinter_window().geometry() == "200x100"
output: def create_tkinter_window():
      import tkinter as tk
  
      def save_data():
          name = name_entry.get()
          age = age_entry.get()
          print(f"Name: {name}, Age: {age}")
  
      root = tk.Tk()
      root.title("User Data Entry")
      root.geometry("200x100")
  
      tk.Label(root, text="Name").grid(row=0, column=0)
      tk.Label(root, text="Age").grid(row=1, column=0)
  
      name_entry = tk.Entry(root)
      age_entry = tk.Entry(root)
  
      name_entry.grid(row=0, column=1)
      age_entry.grid(row=1, column=1)
  
      save_button = tk.Button(root, text="Save", command=save_data)
      save_button.grid(row=2, columnspan=2)
  
      return root