I'm 42 and due with number 3 in mid-December. We started trying for this one four years ago. So my main "issue" with an older-in-life baby is the declining fertility issues you may be dealing with. I ended up needing to use fertility drugs to get pregnant with this little guy. After getting pg. on the first try with my other two, it was such a shock to have those issues. But other than that, I haven't had any problems.
Of course older mothers are at higher risk of entering their pregnancies with something "else" wrong-obesity, high blood pressure, etc...by virtue of their ages. And yes, statistically there are higher chances of something being wrong with the baby...but the chances are still very, very small that something will be seriously wrong.
It's a personal choice that each family has to make, but for us, there was someone missing from our lives. We couldn't give up, we knew he was supposed to be here with us. And now he almost is, and I wouldn't change it for the world, even with all the extra aches and pains and tiredness I am going to be going through for the next 5-10-20 years.
: I'm not one bit sorry to be having him right now...he's coming exactly when he was supposed to, because he is the one who is supposed to be here with us.
Good luck to you whatever you decide.