Ok well here is what I dug up!
On Wookieepedia it says that The Exile visited Nar Shaddaa in the year 3,951 BBY which I'm guessing places that rest of the game in that year as well.
So if we go along those lines Mical, being born in 3,976 BBY, would be 25.
Attons birth year is listed as a guesstimate at (3,980-3,983 BBY) making him in between 29-32.
Mira was born in 3,974 BBY placing her at 23.
Visas was born in the same year as Mical (3,976 BBY) making her 25 as well.
Kreia is believed to have been born in 4,001 BBY only making her about 50.
*whew*
Now I know this isn't concrete evidence but at least it helps us out a little bit.