What age do you have to be for you to have a shot of growing while on T? I turned 17 at the end of April and I'm starting T this month or next, do I have a shot?
Welcome to Susan's Place. People grow in hight at the end of their bones. The growth stops when the bone is capped over preventing additional growth. Estrogen tends to cause this capping to take place earlier and that's the primary reason that girls tend to be shorter than boys. Normally if a FTM is known to be transgender at a young age, they are given a drug that blocks the production of estrogen allowing them to reach normal male hight. The longer you are exposed to estrogen, the more likely the bones have capped over. The only one who can tell you for sure how much hight you will gain is your doctor. The capping process is visible in an X-ray so by seeing how far it has progressed will tell the doctor how much growth potential remains. At 17 it's questionable how much you will grow because it will all depend on how much estrogen your body has been producing. If you were slow to develop feminine traits, your growth potential will be greater.
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Much to my disappointment, the rate at which I gained feminine traits during puberty was painfully normal, and yet I continued to grow an extra 5 inches from age 12 (start of all my joys) to around 27. But this is apparently not common.
A good rule of thumb is that AFAB's will normally be taller than their mother if no hormonal intervention is undertaken pre-puberty, while AMAB sons will usually be taller than their fathers.
I was informed that by the time you're 19-21 your growth plates have fused together so there is no real chance of growing after that.
I know an FTM who started young, I think he was about 14 - 16 when he started his hormones and he actually had a little growth spurt, although he was already really tall, however his younger brother who is like 16 now is apparently taller than he is, so if you do grow I wouldn't expect too much.
(That being said, I'm hoping I'm weird and my growth plates aren't fuzed well and I grow a few inches. -A boy can dream, can't he-)