Probably used Donor Eggs:
Susan Sarandon (??? Can't tell. Could have used FET from her first IVF)
Marcia Gay Harden
So why am I so sure? It is highly...HIGHLY unlikely that anyone over 40 gets pregnant using IVF, much less has twins. I know, from friends, that it happens. But the odds are that none of those women, who had twins or got pg after 46 used their own eggs.
There is nothing wrong with that---obviously!---but be honest 1) to use your "power" for destigmatizing donor eggs and 2) to take always false hopes from regular folks.
Just my kvetching.