That's because your logic is flawed.
The research/medical science doesn't regard it as, nor should you think of it as, some type of calloused OVER TIME accumulation which requires a complicated Tx.
Instead, it's rather clearly cited as a single continuously nourished growth. Duration/age/longevity has nothing to do with this scenario. Consequently, whether it appeared yesterday or as a teen and never resolved, it continuously feeds, which I thought I made clear above, but will endeavor to do so here.
In that respect it's a lot like you. Cut off the nourishment supply, and the organism (human or otherwise), and in this case hormonally imbalanced (whether via puberty, exogenously provided, mutated cancerous, or ideopathic) estrogen-oriented, female-like breast tissue growths...
...DIE!!!
Or look at it as an economic model, simple supply and demand. The growth demands a supply, diminishing supply drives up demand, no supply forces demand to seek alternative sources. Fortunately, there is no alternative source for gyno, so it starves and dies/resolves.
I can fully understand, and even appreciate, how the reasoning mind often seeks to complicate certain matters. However, we should take solace, and be happy that some things are simple, requiring only simple thought.
I really hate that it was all lost, but can't even describe how exhaustive my notes were on this topic, or how many varied types of Tx studies, case studies, and experiments (male, female, single gender groups, mixed cohorts, double blinds, etc.) I examined. One little boy (age 5 or 6) got gyno and none the doctors visited or labs conducted yielded results, they labeled it what else 'idiopathic'. Finally, they discovered in unprecedented fashion, that the little fella got it from his shampoo, that had Tea Tree Oil in it, which negatively interacted with his hormonal matrix.
For an idea of my comprehensiveness, take a look at my sticky on DNP.