Well yes, but it was 44 (had DS2 at 45) and was very planned. :)
Congratulations!
It wasn't too bad, but it was a worse pregnancy than with DS1 (at 39/40) - more acid reflux starting much earlier (12w, just after the nausea went away); SPD this time around; polyhydramnios towards the end of the pg which allowed DS2 to swim around at his leisure and resulted in me having a very managed labour (cervical ripening, followed by ECV, followed by ARM with syntocin drip - not lovely) but I managed to get him out by myself.
Am quite a bit more tired this time around and having a few more problems with bf'ing, but that may not be age-related, more that DS2's tonguetie wasn't dealt with until he was 5wo so his latch isn't so great.
So long as you are relatively fit, and look after yourself a bit more than you would if you weren't pg, you should be fine. I'd also recommend taking pg supplements throughout, to help keep on good form. I started taking extra vit D halfway through as my vit D levels were checked and had dropped quite a lot, which can be bad for the baby.
Chances are you will be labelled a high risk pg, purely because of your age. You might then get consultant care; your hospital might have a high-risk midwife team (they might not, I'm in Australia, they did at my hospital). You may find you are more "managed" through your pg - I had to have 3 glucose tolerance tests, and was scanned far more than I had been with DS1 (again, might be to do with the difference between Aussie and UK systems though, DS1 was UK born). I did get swollen ankles this time around too, didn't with DS1 but luckily no VVs (phew!)