Poll
43%
29%
14%
14%
Early 30's or something...
Bastila was still to young to join the Mandelorian wars, and Revan I think wasn't all that much older then her, maybe early 22, 23.. A few years war and he's 25/26 then 2.5 more of fighting against the Jedi and then Malak and he would be 27.5/28.5 5 years later and he would be around 32/33, but thats a guess at best.
i originally thought early twenties as well. but revan was said to be a powerful jeedai knight and was able to convince all those jeedai to foolow against the councils orders. you also hear about how wise he was as a jeedai. i dont think hed have all that in his early twenties. i know hes revan, but hed barely be outside of being a padawan at 20. i think he would have had to be a knight for a few years at least for him to gain that reputation