I think you'll start losing there soon enough. If you measure your inches, I'm sure you've lost quite a lot of inches in the middle. It's just that it doesn't seem to have gone yet, in relation to the rest of you.
Everyone loses differently.
Well, I'll have to say, though, as we get older, the middle does seem to be the last place to go, but then, sigh,
Don't worry, you will lose it, just stay focused on the good things for you.
((((((HUGS))))))