Could you please edit your post and add the following info to your post.
Product: The Sims 4
Platform:
Which language are you playing the game in?
How often does the bug occur?
What is your current game version number?
What expansions, game packs, and stuff packs do you have installed?
Steps: How can we find the bug ourselves?
What happens when the bug occurs?
What do you expect to see?
Have you installed any customization with the game, e.g. Custom Content or Mods?
Did this issue appear after a specific patch or change you made to your system?
The bug template is currently working on/off but it helps if you are not prompted for the template while editing, please answer the questions anyways.
Going to use this post to post a little re-cap of what I found testing
- This bug effects Long Life Span only. If you play on long, you get days added to your sim every time a transition happens (loading the game, going to CAS, going to World Map). this will make your Sims age eventually.
- Normal Lifespan always works normal.
- Short Lifespan works normal, if that's your initial setting. If you set a game that was on Long to short, they will age down instead of up
- Disabled aging will work as long as the greyed out option doesn't say Long. If it says long, it will add the days even if disabled.
Workarounds
- Do not play any saves that have long lifespan until EA patches this (it's bad, I'm hoping for an emergency patch for it)
- Disable aging for the save. To do so, do not use the resume button but use the LOAD and change the settings from the map before loading your family. I'm not 100% sure that they won't take an initial day hit if you load the household but they shouldn't age further after that.
- Change aging to Normal. instead of disable. This will of course make them age faster but it's not a bad option.
- I don't recommend changing to short but since you like to play on long, I don't think you would want to do that :D
Thanks all that have provided info. Currently nothing more is needed. Just hit that pesky me too button if you are affected.