From: 	Caroline Ann Seawright[SMTP:kunoichi@yoyo.cc.monash.edu.au]

Says Takahashi-sensei. It's in the final manga. Happousai drinks the man

drowned water and doesn't change into a young man. (And age does count
in the Jyusenkyou water curse or else you wouldn't have 'Spring of Drowned
Child')<<

Oh, now I remember. This does have interesting implications. Such as the fact that, even in his 80s, Ranma can be a pretty young girl instead of an old hag when he gets wet. I wonder if he would consider that good or bad....