Wookiepedia says 94 Standard Years. Which is 368 standard days.
At the she is what 15 at the end of Clone Wars the series, maybe 16 at the start of Episode 3, it's 19 years till Episode 4. So 35 at that point, at the end of Return of the Jedi she would be about 40. All we know about episode 7 is that some of the actors from the OT are in talks to reprise their roles but we aren't sure in what context.