This will automatically stop sims in your household (or world, depends on which To reset the days they have on their current life stage, like a young adult is.
Sep 5, 2014 October 3 - Patch day for The Sims 4 on PC/Mac! I'm currently hosting a birthday party for my YA Sim, but I accidentally clicked on the birthday cake twice so she had two birthdays, ageing from YA to adult and then to elder. I tried using the [i]testingcheats true[/i] cheat to.
For The Sims 4 on the PC, a GameFAQs message board topic titled "DeAging Sim". that will take your Sim back one level for example it will turn an adult back into to deage sims (make into different age category) whatever.
My Sim made a toast. I made sure she was holding a drink in her hand, then I clicked on the Sim I wanted to toast to and I had a "Make a toast" interaction option.