I'm one of those that started hrt at 21-22, it was about 3 months before my 22nd bday was when I started it but I had been 2 years already into my social transition, living part time. I didn't go full time till a year and a half later of hrt. So currently at 2 and half of years on hrt.
So it really depends on your genetics and how your body is prehrt, if you're someone like me that was mega skinny(fast metabolism) then putting on weight gradually will go into the female areas of the body at a quicker rate than most, for example my thighs/butt really filled out within the first year or so, at least that's been my experience so far. I went from 120 to 145 lbs but I still have my slim figure, I'm just curvy in the right places now.
My body hair is just like any cis gal's hair now. I've had about 6 sessions of laser but before that I had a really bad shadow, laser has pretty much cleared me completely. Hopefully my next session is my last one.
Breasts have been growing gradually and still are, at a full a/small b cup, depending on the bra style or company. I've lost all of what lil muscle mass I had and it's made a huge difference on my bust size since my back had the most muscle mass and that's shrunken back to how I was before puberty came, same with my neck and shoulders.
All in all hrt has reversed a lot of the ill effects testosterone did to me, so I feel really lucky since I wasn't expecting all of these dramatic changes. But I attribute a lot of it with the fact that my body prehrt was still borderline feminine, tiny wrists, small hands, wide hips..etc I'm guessing I caught myself just in time before my bones were fully set.
Congrats on starting hrt!
