With a timeline we can actually figure this out.

According to the timeline:

Vonta Horn= 33-34 years old
Greyy trespe= 46-47 years old
C4 sith hunter= 10 years old (droid)
R5( cypher)= 20 years old (droid)
Zed 9-= 8 years old (Droid)
K-79 = 6 years old (Droid)
Saber= 8 years old (Droid)
Strike= 9 years old (computer consciousness)
Irman Nogar= Working on it but he is old.
Toryn Sabreen= 63 years old

Not that you will have ever heard of any of these besides the first. But actually I've done RPs with all the characters below. And I completely ignore the timeline and say my characters are whatever age I feel like.

Daemon Hyfe - 59
Gormul Hyfe - 35
Evax Khan - 42
Jagus Kyler - 34

What do you mean I haven't heard of any of them? I've heard of all of them...

Tobal Hadul - 21 or 23. I forget.
alhar alm'puti (Kas) - 8,000+
Lahout - ~600
A.J. Michalson - ~30?

Ages...gah...um...hmm...

Trazu and Varcanna: 22 almost 23
Silonik, Trissan, Kyrtha, Praska, and Tzosha (latter three are the sisters of Silonik and Trissan, whom I hadn't named until now): 2 almost 3
Silliss: 25ish
Rissonik and Naosha: late 40s
Asri: low 20s
Tiosk: Late 40s
K'Satizitus: Hmmm *grabs a general time line* 25,100 + (then again...spirits don't really have an 'age' do they?)

Kamon: 35
Zerxes: 37
Jules: 26
Radon: 35
Jerik: 23

Heir Raktus: Roughly 3,500,000,000 years old

And someday Ill actually write up an rp of such epic scale to describe it. Until then, those of you that know, know, and those that dont, ask.

Joren Logan - 64
Jack Hayter- 33
Vodo Baas - 96

I think I said 32 for Bhindi and about 28 for Trinity, but I really don't remember.

Darth Nihilius: Unknown
Exar Fel: 29
Marka Ragnos: +5000 yr old Dark Side Spirit
Anubis: 21