Re: Game freezes when selecting traits and age

That seems really unlikely. Try doing a test on a freshly generated game folder in a new save, again with no mods. This time drag the whole The Sims 4 folder from Electronic Arts to your desktop and start the game to make a new one, in a "New Game." You'll need to reset your preferences in Options, as part of the goal here is start that settings file fresh.

If you don't have the issue, see if putting your old save into the new Saves file (without mods) works. Don't save, though! You're still testing. If that doesn't work, there's an issue in the save itself. You can try an earlier version of it.

If it does work, try putting small batches of mods and CC back in. Make sure that you've not got any duplicates and that they're all installed as directed by the creators.