Mary Lynn Rajskub was 23 in The Truth About Cats & Dogs when she played the character 'Female Radio Caller (voice)'.
That was over 28 years ago in 1996.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 52, and has starred in 47 movies in total, 44 of those since The Truth About Cats & Dogs was released.
In The Truth About Cats & Dogs, I think Mary Lynn Rajskub looks: