I conceived naturally last year when I was 42 year old (she was a surprise baby as my #1 already 10 years old). Pregnancy was smooth sailing for me, no morning sickness, passed all the prenatal tests and checks, no GD etc. Even went for 2 overseas trips during pregnancy. Only small episode of bleeding in 3rd trimester but not due to my age. Baby delivered via natural birth at 39 weeks and healthy. I can't say I have any tips but I'm healthy in the sense that I don't smoke and try to eat healthy and it helps that my job has relatively zero stress.
I know a few given birth at 40+ to healthy babies. You need to take care of yourself and your health of course. Eat healthy and do some light exercise. Try to avoid getting stressed.
I heard about it. Before 42 weeks is actually possible. Just follow up with ur gyane closely. Make sure baby everything ok.