Do you know what's amusing here? Really really amusing and funny?
I suggest anyone really fixated about passing go to a busy mall, sit down, and just watch. Watch the women going by. And not just the young women. Look at the middle aged women. Look at the older women.
If you're honest with yourself, you see a lot of middle aged and older women who look a bit more masculine. And because of this, an older transwoman can actually pass more readily than a younger one.
Now, to be honest, there's a lot to be said for personal presentation.
Here's a photo of me from just the other night, out with my daughter. I was not misgendered once. Nobody stared. Nobody even gave us a second glance. But I wasn't wearing a hot pink miniskirt, bright pink lipstick, or had size DDDDD breast forms either (just my natural A cups).

But a middle aged to late middle aged transwoman has tons more leeway than younger transwomen, who are being directly compared to fresh young vixens at the top of their biological game. Now some of our younger sisters pull this off in spades. There are some amazingly beautiful younger transwomen. But those who don't feel they belong on the Miss Universe stage need to give themselves a break too.
So just stop with the worries and go sit down in a busy shopping mall and watch. Watch all the shapes and sizes, all the women who've got the entire package and all those who don't. And just realize that you fit on that same spectrum and it's ok.