Aging OFF Can sim get pregnant and what happens?

If I have a question, I usually use the search bar instead of just making a new thread. There could be very good information in an old thread. There may be people that are still having the issue and never found the answer. I have never understood why it is preferable to make a new thread, rather than add on to an existing one that if full of information? I've seen people be really nasty about it, too.