I know mine has slown down (I'm 25) and it's a good thing. I was skinny for the longest time, and it was nearly impossible for me to pack on muscle despite plenty of weight training. Now that my metabolism is no longer running at light speed, I have filled in nicely.
So your metabolism may very well slow soon, and that doesn't have to be a bad thing. If/when it happens you will of course want to adjust your diet/exercise accordingly.
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