Hi ALAR,
I too started developing late (53, last year), and about 9 months after onset, I was just about an A-cup. Yours look to be a bit smaller than mine currently, so I would suggest getting a $4 Walmart brand T-shirt bra in your band size, cup size B to try. I do not use them for support and don't wear them all the time, I just use them to check if I'm still growing.
Once I stabilize, I will either have surgery, of it need be, get properly fitted for a bra if I need one, but until then, $4 is an affordable amount to try things out. If it ends up being the wrong size, it's not a lot of money wasted. If you quickly outgrow it, it's not a lot of money. Also, I have found it easier to go through the self-check lines - I know I won't get looks or questions there. I will say, they do effectively hide the nipples.
The only problem I have found with the cheap bras is lack of selection in my size. I really need a 34 band, but was unable to find the needed C-cup in that size, so since I don't need them for support, I purchased a 36 B (same cup size as 34 C), and it is nearly a perfect fit - other than the loose band. When I outgrow that size, it will be on to the next. I'm just hoping the growth stabilizes soon, because at this point, I have another 3-4 years of potential growth, and at the rate they're growing, I fear a 34DD or more.
As to the MTF image, that is something I have thought about as well, not being the least bit overweight. When a normal size guy starts growing boobs instead of moobs, what are most people going to think? Now with Bruce Jenner publicly going through MTF at 65, it's going to be even more of a thought for us folks.
B