That was over 35 years ago in 1986.
Today she is 47, and has starred in 18 movies in total, 17 since Impure Thoughts was released.
In Impure Thoughts, I think Alyson Hannigan looks:
Impure Thoughts scores 0 out of 10 on The Movie Database.
Alyson Hannigan's first acting role was as 'Patty Stubbs (as Allison Hannigan)' in Impure Thoughts, released in 1986 when she was 12.