Kelly Rowan is only fourteen years older than Adam Brody, who plays her son.
Your comic has turned these two idiots into idiots.
In the pilot episode Ryan says he is 17. Each season was a year because of a Chrismukkah episode per season. Ryan doesn't turn 18 until late season 3 meaning he was 17 for 3 years.
For the first half of season one, Rachel Bilson (Summer) and Melinda Clarke (Julie) were credited as guest stars, even though Rachel Bilson appeared in each episode. From the fourteenth episode on, they were credited on the theme song as regulars.