Kristen Bell was about 23 and then 24 years old during the first season of Veronica Mars in 2004–2005.

How that age is calculated

  • Kristen Bell was born on July 18, 1980.
  • Veronica Mars first aired in the fall 2004 TV season, when she was 24 for most of that broadcast year (23 at the very start of 2004, turning 24 that July).

So when people ask “how old was Kristen Bell in Veronica Mars?”, they are usually referring to season 1, where she was essentially in her mid‑20s playing a high-school student.