The aging bug was fixed, but there's new aging feature which makes it so new created sims will start of with a random number of days instead of 0
MCCC has a setting that allow you to change it back to what it was, where sims start with 0 days in their aging bar.
I don't know if you used to have any mods, but 99.9% all of them broke last November with the Python change
so if you do have anything in your mods folder that is not a cc object, you might wanna delete it and get an updated version of it is available
some more tips about current bugs and how to avoid them:
- avoid living in San Mysuno atm, as it seem to be buggy.
- small pet cages (My First Pet Stuff) are causing issues
- quitting the spotlight (Get Famous) is causing issues, there's a fix here at MTS
- sending your sims to school/work with a sack lunch is causing issues - LittleMsSam has a fix
- too many sims are freezing to death/burning to death with Seasons, LittleMsSam has a fix + Bienchen has a mod that makes sims to auto change cloths to the appropriate ones when they are feeling too cold/hot
LittleMsSam bug fixes:
https://littlemssam.tumblr.com/post...andom-small-bug
Spotlight quitting fix
https://modthesims.info/d/624622/qu...eption-fix.html
Bienchen's Seasons mods (she also has some fixes for the awful random outfits NPCs wear)
https://www.deichschafblog.de/s4/mo...r-jahreszeiten/
MCCC discord (very useful updates there about mod news and current AHQ topics)
https://discord.gg/h6GkGyd