Season 1 of The Office premiered on 2005-03-24. The first episode of the season was filmed around 2004. Here are the cast ages at the time of filming.
| Actor | Character | Age at Filming | Birthplace | Also Known For |
|---|---|---|---|---|
| Steve Carell | Michael Scott | 41.5 years | Concord, MA | The 40-Year-Old Virgin, Crazy Stupid Love |
| Rainn Wilson | Dwight Schrute | 38.1 years | Seattle, WA | Six Feet Under, Backstrom |
| John Krasinski | Jim Halpert | 24.3 years | Newton, MA | A Quiet Place, Jack Ryan (Amazon) |
| Jenna Fischer | Pam Beesly | 30.0 years | Fort Wayne, IN | Walk Hard, Splitting Up Together |
| B. J. Novak | Ryan Howard | 24.6 years | Newton, MA | Writer, Inglourious Basterds |
| Mindy Kaling | Kelly Kapoor | 24.7 years | Cambridge, MA | The Mindy Project, Never Have I Ever |
| Leslie David Baker | Stanley Hudson | 46.0 years | Chicago, IL | Character actor, commercials |
| Brian Baumgartner | Kevin Malone | 31.2 years | Atlanta, GA | Into Temptation |
| Angela Kinsey | Angela Martin | 32.7 years | Jakarta, Indonesia | Your Family or Mine, Haters Back Off |
| Oscar Nunez | Oscar Martinez | 45.3 years | Colón, Cuba | The Paper |
| Phyllis Smith | Phyllis Lapin-Vance | 52.6 years | St. Louis, MO | Bad Teacher, Inside Out (Sadness) |
| Kate Flannery | Meredith Palmer | 39.7 years | Philadelphia, PA | Comedian, Dancing with the Stars |
| Creed Bratton | Creed Bratton | 61.0 years | Los Angeles, CA | The Grass Roots (musician) |
| Paul Lieberstein | Toby Flenderson | 37.0 years | Concord, MA | Writer/showrunner (s5-8) |
| David Denman | Roy Anderson | 30.6 years | Laguna Beach, CA | The Replacements |
Steve Carell was approximately 41.5 years old when The Office Season 1 was filmed around 2004.
Rainn Wilson was approximately 38.1 years old when The Office Season 1 was filmed around 2004.
John Krasinski was approximately 24.3 years old when The Office Season 1 was filmed around 2004.
Jenna Fischer was approximately 30.0 years old when The Office Season 1 was filmed around 2004.
B. J. Novak was approximately 24.6 years old when The Office Season 1 was filmed around 2004.
Mindy Kaling was approximately 24.7 years old when The Office Season 1 was filmed around 2004.
Leslie David Baker was approximately 46.0 years old when The Office Season 1 was filmed around 2004.
Brian Baumgartner was approximately 31.2 years old when The Office Season 1 was filmed around 2004.
Angela Kinsey was approximately 32.7 years old when The Office Season 1 was filmed around 2004.
Oscar Nunez was approximately 45.3 years old when The Office Season 1 was filmed around 2004.
Phyllis Smith was approximately 52.6 years old when The Office Season 1 was filmed around 2004.
Kate Flannery was approximately 39.7 years old when The Office Season 1 was filmed around 2004.
Creed Bratton was approximately 61.0 years old when The Office Season 1 was filmed around 2004.
Paul Lieberstein was approximately 37.0 years old when The Office Season 1 was filmed around 2004.
David Denman was approximately 30.6 years old when The Office Season 1 was filmed around 2004.