I think it's the shadows sharpening your features, and the sort of deadpan look you are giving the mirror. They combine to give you a more physically mature look. Like you've stepped three years into the future.
Completely unsurprisingly, you still look beautiful, if mildly reproaching.
you do look different. i'm not sure if older is what i'd say, but different. i think your chin looks a little more square than in other photos. don't know if that's possible. maybe just a different angle than usual...gorgeous as always though