Extra question for you all #2- Just exactly how old is everyone in Ranma?

Ranma, Akane, and I think Kodachi are 16

Yep.

Nabiki, Tatewaki are 17

Yep.

Kasumi is 19

Yep.

Gosunkugi is a freshman so he should be 15 or so...

He's in Akane and Ranma's class - he's 16.

Mousse and Shampoo's ages are not listed, I  would guess 16 or 17.

16 ...

Genma, Soun, and Nadoka are in they're late 30's or early 40's.
Hinako Ninomiya is like 21..
Happ and Cologne are about a couple 100 year old

Happousai - 150
Cologne - 100

Ryu Kumon is 16 or 17 I think...

16...

Ukyo is 16 I think...

Yep...

Ryouga is 16 I think...

Yep...

Tofu is in his 20's
Shinnouske is about 16 or 17

16...

Tsubasa is about 16 or so...
Akari is either 16 or 17...

16...

Mikado - 16
Azusa - 16 (she's a 'burikku')

Kunoichi- ummm I'm not sure...
Herb, Mint and Lime- I don't know
Gambling King, Picolett Chardin, Saffran, Shampoo's dad, Jusenkyo's Guide, that big cat, Principal Kuno, and Sasuke.  beats me..

All of Ranma's opponents are 16, the same age as him, as are all of
his friends, unless otherwise stated (Kunou, being 17, Nabiki 17,
Kasumi 19) or if they are middle aged or old.

Gambling King is possibly ageless or middle aged.

Jyusenkyou Guide - middle aged like all the parents in the series

Plumb - About 7 or 8...

Sasuke - Quite probably middle aged

Kun-chan...