i dont know about ''undoing a birthday'' but i do no how to stop your sims from aging ( getting older.)
if you go on the ''...'' sign, when you click to save the game, go on options->game options and it says ''enable aging'' un-tick that box,
then you wont get old
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no, the only holiday that is celebrated is your sims' birthdays
You can't undo it when you save.
You can't undo what you already bulldozed.
Lots are out. The sims 3 university, sims 3 nightlife, sims 3 adventures, sims 3 generations... you name it!
No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.