Hey wolf, adult aspirations should work fine.
So as it turns out, I was right about the public enemy aspiration being an issue now. The witness a Sims death requirement isn't broken, but it is almost impossible to fulfill without a lot of luck. I just had an elder die in my household. My sim wasn't in the room at the time, but I ran him over the instant I got the notification. Didn't matter. You have to witness the instant of death.
In addition, if the sim has anything else queued up, they won't witness it. It's an entirely automatic action, which means if you arent in the room doing nothing at the time the sim dies, then you don't get the requirement. Without the ability to kill off a Sim, completing the aspiration becomes a matter of luck. You can even get unlucky, you can be in the room doing nothing, but your sim might auto queue a cook food order and miss the moment of death.
Edit: I have screen shots showing the dying elder, the one sim that witnessed it, one running off to cook even though he was in the area at time of death, and my last sim not witnessing it even though he is obviously watching it happen. There isn't an interaction to witness it.