You can find all the recent bugs, and all the old ones too, at EA Answers. https://answers.ea.com/t5/The-Sims-4/ct-p/the-sims-4-en
There was a bug last November with Sims not aging when blowing out candles but it was fixed in one of the December patches. I don't think there's been anything like that since.
https://answers.ea.com/t5/Bug-Reports/FIXED-Sim-doesn-t-age-up-by-blowing-out-candles/m-p/9716468#M160343
There are also some special Sims in the game who don't age because they have special traits that prevent it. This includes Baby Ariel and Alex Moyer, and probably a few others.