Kirstie Alley was 30 in Star Trek II: The Wrath of Khan when she played the character 'Lt. Saavik'.
That was over 41 years ago in 1982.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 71, and has starred in 49 movies in total, 48 of those since Star Trek II: The Wrath of Khan was released.
In Star Trek II: The Wrath of Khan, I think Kirstie Alley looks: