The following is my rough timeline for the aging of Jack Bauer, lead character on 24. The original inspiration for this post was the 24 Wikipedia entry. While browsing, I noticed the way time absolutely flies between 24 seasons.
24 first aired in November 2001, and was set on the day of the California presidential primary, but no specific year was provided. Just to make things simple, I've arbitrarily chosen 2000, which puts day one in June of 2000. Any year, however, would work just fine for tracking Jack's age.
In June of 2000, Kiefer Sutherland was 34.5, so let's assume that was Jack Bauer's age as well. From there, as the seasons progress, time moves rapidly. In the following table, all of the After Prior Day values came from the 24 Timeline on wikia.com. (Season 8 and Live Another Day were not sourced from wikia.com.)
|Season Number||Start Date||After Prior Day||Jack's Age|
|#2||Dec 2001||18 months||36|
|#3||Dec 2004||36 months||39|
|#4||Jun 2006||18 months||40.5|
|#5||Dec 2007||18 months||42|
|#6||Aug 2009||20 months||43.5+|
|'Redemption' movie||Feb 2013||42 months||47+|
|#7||Apr 2013||2 months||47+|
|#8||Sep 2014||18 months||49ish|
|Live Another Day||Sep 2018||48 months||53ish|
The only real issue with this is that the timing of the Redemption movie is off--it's supposed to occur on the day of the presidential inauguration, which has been on January 20th or 21st for over 70 years now, but the timeline shows it in February. I'm not sure why there's a discrepancy.