Do you know that there is truth to the beauty secret that a cold rinse is good for you?  After your bath, rinse off with cold water.  What it does is stimulate the nerve surrounding the pores to help produce new cells, which explains the youthful look. 
Cold water speeds up metabolism, it is now also being looked into as being an effective diet aid.  Hot water in your bath breaks up the capillaries and dries up the skin. This explains why you eventually end up with drier skin when you bathe with warm water.