Another misconception people have is that trans women are inherently stronger than cis women, which isn’t true. I know from anecdotal evidence, that it is extremely difficult for me to open jars now that I’ve been on estrogen and t blockers for over a year. My t is actually under the normal range for cis women, and usually I have to get my cis sister to open jars because she’s stronger than me now.
Also newer studies have shown trans women don’t actually have the competitive advantage conservatives say they have.
https://www.msnbc.com/opinion/msnbc-opinion/olympic-trans-women-ioc-study-rcna148437
I do think their muscle would still be significantly reduced by the hormones, but the older someone is the more their body is “set in place.” This means any changes will take longer to occur and they may not happen to the degree that they would have if they started younger. So someone starting mid 20s - 30s likely won’t have skeletal changes, since that part of their body has already finished growing. (Someone starting as a young teen definitely will have skeletal changes though.)