Discuss the series, characters and episodes.
Felix and Sara are only a year apart. Felicity and Felix are 3 years apart. So if Felix was 11 by the end of S1, Sara would have been 12 by the end of it. That's not that hard to believe, but then it messes with the idea that Felicity is 13 at the beginning of S2 and Felix is 12 in S3.