Can I make my Sims age again? What is a workaround for this bug?

I seem to have a bug that is preventing my Sims from aging. It happened after my Sim had a baby. The "x days left until aging" bar never increases. Aging IS active in my game options.

I found this thread on The Sims 3 that discusses the bug but no one mentioned any solutions. Is there any way to get around this? I have every EP except Seasons and none of the Stuff Packs.

Solution 1:

I think you have to throw a birthday party if I remember correctly.

Even in the post you quote it mentions

" I age them up with the TCE cheat. "

See more of the cheat from here (changed link to a better one, you would want the ageuptonpc cheat.)