Why does your face get fatter as you age?

I am not sure why, but I have the same problem (I'm 26). I have lost 6 kgs (13.2 lbs) over the past 2 months, so I am currently 130 lbs, 5ft 7 and 1/2, but my face still isn't thin enough. Try applying a foundation that is below your jaw-line and also try herbal diuretics (I think part of the problem is water retention).