Everyone passes for a teenager EXCEPT Kathleen Turner
Nick Cage, Catherine Hicks, Joan Allen, Kevin O'Conner, Barry Miller and Jim Carey all look and act like teenagers in this movie. The star, Kathleen Turner, looks older than 32 (her age during filming) and in no way resembles a teenager.
Back to the Future came out just the year before PSGM. Contrast Lea Thompson switching seamlessly between the older disillusioned bitter mom and the hot to trot teenager after MJF shows up in 1955. Too bad. KT was simply miscast, didn't rise to the acting challenge or both,