I don't have time to guess at all of the main and supporting characters, but I'd put Revan somewhere in his/her mid thirties as of KotOR I, and the Exile in her/his mid to late thirties as of TSL.
"There is something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty." -Winston Churchill
"For of all sad words of tongue or pen, The saddest are these: 'It might have been!'" -John Whittier
"Apathy is death." -Kreia