Hi Harley Quinn,
The research was done and published by the European Endocrine society! I have been told I am not at high enough level to post links by the moderators, but the study is "Effects of oral and transdermal estrogen on IGF1, IGFBP3, IGFBP1, serum lipids, and glucose in patients with hypopituitarism during GH treatment: a randomized study". It is heavy reading but it is referenced in good page called "Hormonal Breast enhancement" which is a little easier to read on Wikipedia. A search engine should find them for you.
Yes I would love to be 34 or 36, try 38 or 40 for me! T and genetics hits some of us harder.
I hope this helps!
Hugs Riki