@Lastchance75 - really sorry to hear this news. It's just awful. I am angry on your behalf.
I think over 40s have two hurdles - that the embryo is normal, which is what PGD is for and secondly that it has the energy to keep dividing and growing once it is transferred and then implants. That's what my FS has told me which doesn't give much hope for a PGD normal embryo, but I guess it prepares you for the fact the odds lean in favour of it failing as if you say there is a 40% chance of success with a normal embryo there is a 60% chance of it failing.
As others have commented it makes you wonder how anyone gets pregnant. I have children and now I look back and think what f***ing planets must have aligned at that time that meant I actually got pregnant.