From the internet movie database, www.imdb.com

Roswell Beauty Lies About Age

Actress Majandra Delfino lied about her age to get on hit sci-fi TV series
Roswell. The beauty who plays Maria Deluca on the program was just
17-years-old when she auditioned for the role but told the director she was
18. She says, "I had just done a movie where I was treated as an adult -
there's this legal thing that if you're six months away from your 18th
birthday and it's the summer, you can work as an adult or something."
Majandra's deception only came to light when she asked for a studio tutor in
her contract.