I have gyne since age 12, 52 years ago. Based on my personal history and observing many others in a number of nutritional programs correcting the most common nutritional deficiencies we have. Low methylb12, adenosylb12 and methylfolate can cause testosterone to drop and supplementation can also restore levels in some people. There are changes in the digestive system that accumulate past age 50 that make it difficult to absorb the natural b12s from the animal food products in which it exists. Low testosterone and dozens of the symptoms of low testosterone all appear with low b12s/mfolate. I don't know that there is a causal relationship but there is a correlation. Whether this leads to gyne directly or indirectly is not known but there appears to be at least a co-incidence. Percentage of incidence in the 50s is also about the same. According to some researchers, there are about 600 biochemical reaction chains are affected by low MB12/ADB12/MFOLATE. As each of these can be traced down and show complex patterns of things biochemical out of balance. If it does affect the many hormones on a going forward basis, it doesn't cause any shrinkage of tissue that has already grown. However, it can relieve all those ongoing functional symptoms of tiredness, abnormal tissue growth, abnormal cells, abnormal metabolism, mood effects, personality effects and so on.
When sufficient mb12/adb12/mfolate are taken, many biochemical abnormalities correct and other items, other nutrients and meds, frequently work better.
I honestly don't have any answers on what to do about gyne. I can make a case for each possibility.
The possibility exists that both the growth of breasts AND neuropsyc mood and personality effects could be from common causality in some cases. I was depressed for much of my life until one hour after taking methylb12. If b12/folate are connected and another consideration is that many drugs while affecting hormones directly may also have anti-folate and/or b12 qualities. If the neuropsyc symptoms are from the nutrient deficiency(s) they may be correctable with nutrients.
Further underlying most of the suffering and misery are the cultural teaching of body shame and perhaps narcissism as the way to be. With something so totally common as a lifetime incidence of around 50% would indicate, where it is everywhere one looks, how does our society convince so many to despise themselves? Cultural teaching and memes certainly varies from one country to another. It used to be the women who despised their bodies in many particulars. Gyne has been a problem my whole lifetime. At this point it really doesn't matter at all. It affects my life in no way. I have a good relationship, but gyne has never affected my dating or relationship life except for all the opportunities I turned down because of my fears. I wear whatever ordinary clothing I want to. I also discovered by age 20 that the great equalizer is for everybody to get nude. Nobody bullies or targets another when nude because everybody is equally vulnerable to having a less than perfect body. In 44 years of practicing social nudity I have never seen a perfect body. It is also an excellent setting for learning to accept one's body and can succeed.
Good luck.