How old is Dr. Tofu?

Never stated.  Probably in his mid-twenties or even early thirties.

What did Happosai look like when he was young?

Most likely somewhere in between his own version of himself (extremely
handsome) and Cologne's version of him (short, ugly, just younger).  I'd
put him as a plain looking guy, not exceptional in any way except his MA
training...

Hunter Kid
http://www.serve.com/guilds/ranma/
guilds@mail.serve.com

open hk.sig

    The slender girl, Ryako, only gave him a cute, yet somewhat wolfish,
grin.  "Aw, you're no fun, Ryoga," she said, hitting him on the shoulder
playfully.  "Here we are, so close, and you won't let me read what you're
writing?"  She snuggled up against him, smirking to herself.
    Ryoga apparently didn't notice that she was only kidding, because his
face glowed a bright red and he nervously inched away from her.  "C-close?"
 He stammered.  "I...well...you see..."   
			 			-from Ryoga 1/2, chapter 11
[hk.sig; errors-0; file terminating]