Create A Mod – Let’s Make a Mod


Create A Mod – Let’s Make a Mod will teach you how to create your first mod. Before you begin this tutorial, please make sure that you’ve followed these previous tutorials:

Create A Mod – Programs for Modding
Create A Mod – Setting Up

Let’s Make a Mod

Today I’m going to show you how to make your very own Aging Mod so that you can set your sims age spans to your very own desired lengths. I’ll be showing you many different things that you can do later in the series. For now, I just want you to get your toes wet a little before we dive completely in. Let’s get started!


Creating the Mod

  1. Open your 6_16 folder (inside Mod Creating>Sims 4 Studio).
  2. In the search box where it says Search 6_16, let’s go ahead and type in aging.
  3. Several resources will pop up, we want the one that’s named sims.aging.aging_tuning.Tuning.xml, as shown below:
  4. Double-click to open it.

Note – If it doesn’t automatically open with Notepad ++, right-click on the XML and select Properties. Where it says Opens with, click on the Change button, navigate to and select your notepad++.exe and click open, then click Apply. Close the window and redo Step 4.

  1. Now that you have your XML open in Notepad++, it’s time to do some editing. Scroll down until you find <E n=”key”>ADULT</E>. A little down from there you will see <T n=”age_transition_threshold”>20</T> which is the age span in days for an adult sim:
  2. Double-click on the number 20 and it will automatically highlight in green. Now just enter your desired age length for adult. Don’t delete or move anything else, just change the number.

    Note – The words in green are called comments. Reading these will usually help you recognize what it’s for and what it means. I will go into more detail on reading these and other elements in XMLs later in this series.

  3. Let’s scroll down and change the lengths for BABY, CHILD, ELDER, TEEN, AND YOUNG ADULT. Change them to your desired length or leave them at their defaults:      
  4. When you’re done, go to File>Save As (*Do NOT click File>Save) . Then Save it in your Modded XMLs folder (Mod Creating>Sims 4 Studio). Do NOT rename it, otherwise it will not load when you import it into Sims 4 Studio for packaging next.

*Note – You don’t want to click File>Save because that will overwrite the original which you will need later when checking your Mods for needed updates after a patch.

Packaging the Mod

Now that you’re done editing your XMLs, it’s time to package your mod.

  1. Open Sims 4 Studio.
  2. Go to Tools>Create Empty Package, it will then ask you to save your package. Put the name of your mod in the File name box and click Save (save to your Desktop so you can easily find it):
  3. Now that your empty package is loaded into Sims 4 Studio, click on the Batch Import button at the bottom:
  4. Navigate to your Modded XMLs folder (inside Mod Creating>Sims 4 Studio). Select your edited XML(s) and click Open:
  5. Our resource(s) will now be in our new package.
  6. Click on the Tuning file in the left box and the XML will show in the right. Just go through and double-check your changes. You can edit your XML right there in the box if you need to.
  7. If everything is as you want them, then go ahead and click Save.

Note – You could do all of your edits right in Sims 4 Studio like this, however doing it the way we did is better because Notepad++ will warn you with a pop-up if you delete anything that you’re not supposed to.

  1. Congratulations, you just finished your mod!! Now move it from your Desktop to your Documents\Electronic Arts\The Sims 4\Mods folder so you can test it!


Testing the Mod

Now it’s time to test your mod. You will ALWAYS want to test your mod. Even if you’re absolutely sure you did everything perfectly, test just to be on the safe side. There’s different ways to test different mods to ensure they’re working as you intended. For this one, the best way to test is to do the following:

    1. Create a new “Test” save.
    2. Create a family with a sim for each of the age groups that you changed, they don’t have to be perfect just randomize everything they’re only to test.
    3. Move them into a lot.
    4. Press Y to open up Simology, then hover over the age bar.
    5. If the days until age up is the same as you set them to, then your mod is working correctly!

If your mod isn’t working properly, try going through the tutorial one more time. Feel free to contact me if you’re having problems and I’ll take a look at your mod and do what I can to help.

Previous articleCreate A Mod – Setting Up
Next articleThe Sims Official: Snapchat Audio Session
I'm a wife and mother. I enjoy spending time with my family, photography, cooking, and swimming. I've been playing The Sims series since 2000 when the first one was released. I fell in love with it and have been playing ever since. I started modding in Sims 2 and continued to do so for Sims 3 and Sims 4. Other games I love to play are the Dragon Age series, Final Fantasy, and Fable.