Hey you’re not that old ! You only feel old because you have a teenager.
Congratulations, too.
I fell pregnant at 42, it was not too bad even then.
It is definitely harder the older you get, so you have to pay attention to your body and get it ready. You can’t just pitch up and push! (Unless you were already very fit and healthy.)
But 36 isn’t old. It’s actually pretty average now
Is your BMI and fitness ok? Now the fine weather is here you should try and get fitter, stronger. If you aren’t fit, then do lots of brisk walking, swimming (when pools open) and gentle yoga. Stretching and bending will help with the bloating too. Make sure you are staying thoroughly hydrated, even if it means you are peeing a lot. Fluids actually help reduce bloating.
It will help loads with the birth and what follows, if you can be physically fit, especially if you are working full time up to the due date (sheesh, that was the hard bit, and I admit I caved and stopped at 38 weeks and I would recommend doing similar, if you can possibly save the holiday).