i went through MIVF and the choice of how many i had tranferred was always left up to me. I had my first tranfer at 28 and had two tranferred just after turning 29 and had b/g twins. So i was under 30 and had 2 put back. However this was nearly 7 years ago, so perhaps things have changed.

I went back to IVF and was doing cycles up to 18 months ago and was allowed to tranfer two again if i wanted- but i was over 30 by them. I chose then to only have one back at a time lol

i guess it depends on your FS
good luck!!!!