I'm 17 and a trans guy. I pass roughly 70% of the time, I'd say, when I'm binding. Through various things people have said (e.g. some guy once told me I must have a couple of years until I do my GCSEs, when I did them last year, etc), I've worked out that the reason I pass is because people assume I'm about 13, and pre-pubescent. I've recently been worrying about how long I'll be able to maintain this. Because, while I won't develop any further than I already have, I assume I'll start to look older. And it's quite hard to imagine passing as a 13 year old when I'm, say, 25.
I'm currently not persueing medical transition (for complicated reasons), but even if I was to begin to persuade it now, it'd be at least 4 years before I could begin it, due to waiting lists. So essentially I'm concerned that I'm coming to the end of the period of my life in which I can successfully pass. I'm wondering if anyone has any idea whether there's any chance that I will continue to be read as a pre-pubescent boy into my 20s? Also, have any trans guys on here managed to pass as a post-puberty guy, pre-hormones?