I'm quite certain I'm represented in the threads the pp posted.
I'm a mom of twins and I STRONGLY advocate for transferring one.
I also agree w/ a PP who said that doing one at a time means you have the option to adjust your protocol if the doctors advise.
With your own eggs at that age you are likely at reduced probability for twins, but if were doing things over I would have only transferred one at a time - for so many reasons that I'm sure are articulated on the linked threads.
Good luck OP!
(Also, if you do end up w/ twins - don't panic. I had a very healthy pregnancy, healthy calm delivery, healthy full-term babies, etc... And I was 44! So don't panic.

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