if she's 40 it will be very difficult to bingo.
38 is still ok but start to bingo with difficulty.
if bingo, it's fine. just need to check up carefully.
even young women have to check carefully.
i started trying at 31 and now 34. 3 miscarriages and still trying. for me, early 30's also get many problems so it depends on her body and c6's body condition.