Erika Christensen was 14 in Leave It to Beaver when she played the character 'Karen'.
That was over 27 years ago in 1997.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 41, and has starred in 31 movies in total, 30 of those since Leave It to Beaver was released.
In Leave It to Beaver, I think Erika Christensen looks: