Guys, you've helped me alot!
Folder removal technique PART 2:
I took Zazazu's advice and redid the whole folder removal technique - I removed all folders with any connection to the sim: defaults, skintones, eyes, hair, clothes etc. Including saved sims and a weird folder I had named 'Unknown'
After that, the game worked, so then I added back one folder at a time - and cleared cache in between
every time- until the game crashed again. It turns out there was some skintones and such placed in a folder where it shouldn't be, that's why I couldn't find it before. Apparently I had put some files from sims I had downloaded and installed in there.
After I removed most of the files in that folder, I got the game to work. I have now aged two sims to elder! Yay!
I am hoping I won't run into any trouble again soon...this was energy draining. But thanks to you guys I don't have to reinstall my game. Thanks.