TL;DR: All humans naturally transition and experience both genders if they hit sufficient age. Thoughts? Are there studies about this?

Theory: Fetuses, before forming sex characteristics, are biologically androgynous and develop binary sex characteristics in response to hormones. As evidenced by the trans, intersex, and gender non-conforming people, those hormones can go haywire at any point in development, and science has mostly found ways to accommodate and change those hormones as needed for the desired results. Humans are pretty androgynous before the start of puberty, after which point they have secondary sex characteristics. But what if there are tertiary sex characteristics that indicate a second puberty after the first? Many natural signs of aging that are split by sex can be explained by a “loss of hormone production” but doctors are often only measuring the perceived appropriate hormone for cis people (estrogen for post-menopausal women and testosterone for men) even though the opposite hormone still exists and may be changing the body in absence of the original. What if, without medical intervention, every elderly cis person is actually transitioning, and trans-identifying people have found a way to speed up that process while mitigating the risks by the removal of sex organs (that are dysphoric but also pose more health risks as we age)?

Context: I’m non-binary, and am currently on hormones to transition to being more masculine, though I’m still questioning my gender identity as to how far I want to take my transition or if I want to appear more androgynous overall. I have not quite gotten my bachelor’s degree yet, but my emphasis is in Psychology with a minors in Anthropology and Gender Studies from a pretty small school, not conservative but in a red state. I ran the LGBTQ related clubs on campus and was considered overall more knowledgeable by faculty in those areas than the majority of professors or staff, though I was just learning and trying to educate myself as much as possible for the sake of others on campus. I acknowledge that this could be 100% wrong, there could already be studies on this that I am not familiar with and therefore cannot look into myself, or that this theory might be viewed as problematic by either cis or trans people I am honestly just trying to get a critique and discussion about something I am genuinely curious about and want to look into further. Absolutely feel free to roast me in the comments if you have counterpoints, but please don’t downvote to the point that it doesn’t get seen.