Adrianne Palicki was 19 in The Robinsons: Lost in Space when she played the character 'Judy Robinson'.
That was over 20 years ago in 2004.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 40, and has starred in 17 movies in total, 16 of those since The Robinsons: Lost in Space was released.
In The Robinsons: Lost in Space, I think Adrianne Palicki looks: