I started HRT at 19 and like someone else said the hip bones usually don't fuse until the mid twenties or until your 30. I personally have had some hip growth with the bones actually. Honestly though if your hips widen, and mine could still be widening too, it's a process that will take a few years to actually finish. It might not be noticable at first then one day you're walking and you hit your hip on a corner cause it's bigger lol.