Not read all of the comments.
It would very much depend on the circumstances surrounding the person wishing to become pregnant.
When I'd been in my current relationship for a few years, I was still late 40's.
My darling love is a good deal younger, and so, if we could've made a child between us, we would've done, as we both felt that he could be the main care provider, as maybe I might not have been fit enough to take the main tasks on.
It's a mute point, coz we were not successful, but we felt we had probably put more thought into that proposed baby, than either of us had in the children we had both parented in our earlier years.
I see that I'm not like the majority of folks responding, and that's cool, coz it's all subjective, personal and circumstantial.
It's maddening tho' coz amazingly, I don't just feel fitter 20 + years on, I can show that I am physically fitter and stronger, due to a complete change in lifestyle, and the exemplary support I receive from my partner.
We both believe we would've made good parents again, second time around due to the life's lessons learnt along the way.
If OP, you are contemplating pregnancy at a later than average age, please don't stint on researching every possible aspect, not just of your current situation, but as other pp have said, what about all the future challenging stages, and what if you suffer ill health in the future, and or someone your close to (that is central to bringing up the child) has a misfortune.
If you find it's still the right decision after everything, then that's all you can do.
Even younger mums can't predict how they'll cope with pregnancy and the birth and all that follows.
Good luck, and I hope you make a decision you will always be happy with.