@107531kopAccording to the tuning files and the experiments of some people short lifespan has also been changed (this is not yet reflected in the mentioned Fandom article). Toddlers now only have 3 days and YA and A 11. This really sucks and I still refuse to play my short lifespan legacy since I assume this was not intentional and hope that they fix it. At least it does not make sense at all to shorten short lifespan, while normal is made longer...
If they don't fix it I fear I will have to mod the lifespan, but I would very much like to avoid that, since aging mods seem not the best idea currently...
I also experienced this bug:
https://answers.ea.com/t5/Bug-Reports/CURRENT-ISSUE-Sims-age-up-go-back-in-age-on-first-load-days/td-p/11693048 So unfortunately the ages of my Sims are totally wrong when I load my old backup save ☹️ (interestingly they were fine between the patches, so it must have been something in the "fix").
I would really like to know if it's similar for you. There seem not to be so many short lifespan players around here (although it seems some long lifespan players get younger Sims than they should).
Just always keep your old backup if you're testing something!