Twinky (1970) - Trailer
AKA 'Lola'
A 38 year old American novelist discovers the difficulties of being married to a British 16 year old schoolgirl.
Director: Richard Donner
Writers: Norman Thaddeus Vane (original story), Norman Thaddeus Vane (screenplay)
Stars: Charles Bronson, Orson Bean, Honor Blackman
https://www.imdb.com/title/tt0064598/