Know what you mean. The skin on my sack hangs lower now that I'm older....LOL
J/K
It may just be that you are retaining more water. Are you taking any "supplements", supplements or have you increased sodium intake?
Squeeze you forearm and count how long the "white mark" stays on your skin. The longer you can see it, the more water you are retaining.
How old are you?
-SZ