With all the anarchy in the Gallagher household, it can be challenging to keep track of how old the characters in Shameless are from the beginning to the end of the show. When the comedy-drama series debuted on Showtime in 2011, all of the Gallagher kids (except for Fiona) were still minors. By the time the series wrapped up with the season 11 finale in the spring of 2021, all except Liam were adults with jobs and — in some cases — kids of their own.
Monica Gallagher had six children before walking out on the family and leaving Fiona to take on the brunt of the parenting (even more so than she already had). In a rant in season 1, Frank helpfully spells out the age differences between the kids, saying that Monica left when Emmy Rossum's Fiona was 14, Lip was 11, Ian was 10, Debbie was seven, Carl was five, and Liam was four months old. Of course, this being Frank, there's probably some room for error in his calculation of the kids' ages. Other clues in the show indicate that Emmy Rossum's Fiona is actually around five years older than Lip, not three.
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The Shameless timeline is notoriously riddled with continuity issues, which often makes it difficult to track how much time passes between seasons and how old the various characters are. In an interview with EW, creator John Wells joked that the show is written on «Shameless time,» with some characters' storylines taking place over a few days while others take place over several weeks. However, thanks to mentions of their age in dialogue, it's possible to pin down their ages when the story begins, and how old they are when things wrap up in the Shameless season 11 finale.
In Shameless season 1, Fiona is 21, Lip is 16, Ian is 15,
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