I have definitely started to be mis-aged over the last couple of weeks, about 5 weeks into HRT. I've actually always kind of had a thing with asking other people to guess my age, so this has been kind of fun. Before HRT, most people guessed my age almost spot-on correctly, usually guessing somewhere between 26 to 28 (I'm 27.) Recently, though, whenever I'm at at a poker table full of old guys and joke around about my age, their average guesses have been consistently going down. The last time I got the opportunity to ask, people were starting to consistently guess somewhere around 23-24 on average. So, YAY! Honestly, I actually feel like I look a LOT younger than I did when I really was 23. (Stress played a huge part in that. I aged VERY quickly in late high school and my first 3 years of college. So when I really was 23, people always guessed that I was in my late 20's. So it's kind of ironic that I looked 27 at age 23, but now that I actually am 27, people think that I'm 23. That is pretty awesome.)
I still haven't even come close to being misgendered when still in "boy mode" yet. Sigh... some day. I'm so jealous of you girls.

I love it when people use female pronouns for me on the internet so much... I can't wait until it can be in real life too.