A Jewish couple should go as far as they possibly can without straining themselves or significantly draining their finances (meaning, mortgaging away the rest of their lives).
But, at a certain point, age is a factor. In my opinion, IVF should stop around age 45. Currently, many clinics allow 55. I have not heard of any naturally born children to women of 55. As you get older, the chance of having problems is significantly higher and that isn’t fair to the child. In addition, if the woman is 55 when she gives birth, she is grandparent age when the child reaches adulthood. That means placing a possibly unnecessary burdern on the child to take care of them at a younger age.