Zerbu put 30 new skin tones that you can use for sims of all ages! They come in white, orange, red and brown variations.
To install these simply extract the .package file from the downloaded .zip file into Electronic Arts > The Sims 4 > Mods folder. Make sure you have mods and custom content enabled!
Here’s a skin tone I tested in-game. The custom skin tones are marked with the wrench icon.
To download these skin tones, click the button below!