I wanted a vampire teen sim that could do all young adult interactions, found a glitch that made my sim a vampire young adult that looks like a teen BUT the needs are still for the teen.
Doesn't matter but when I tried to drink plasma off another sim I couldn't.
It seems that the drink interaction is connected to the thirst need.
Can anyone tell me how to change the needs to be for the young adult ones?
My sim is living on plasma fruits and drinks now.

I would also be interested in this. Also, does anyone know whether it's possible to add new needs, or edit the specifics of existing ones?

My sim has the immortal perk so I kind of want her to have the Energy need for plantsims to have a kind of daylight vampire.