Try, if that is what you two want. Fertility drops off after age 40 but a good fertility doc may help.
Yes it is expensive but if you can afford it, then go for it. The oldest first time mother I delivered was 49 years old. She had used donated eggs (harvested from 20+ year old).
In 1976 when I was at bethel and met many branch overseer's wives who were going through menopause and lamenting that they would have had children first before going into full time work if they knew "this system" was going to last as long as it had. That influenced me to change my mind from "waiting until after Armageddon" to leave bethel and have a family. I am so glad I did. Now I have grandchildren, which none are JWs :-)