Well said, Marzipan Girl, I believe yours is the most thoughtful comment on this thread.
For me, the movie acted almost as a mirror in respect to our modern acculturated ageism. It seems that relationships are free to cross all other boundaries of class, culture, religion, status, race and gender identity, so why should age - or more aptly, age difference - be considered an insurmountable barrier to personal happiness? Haven't the critics of this movie's premise heard of `human rights'? Or don't they ascribe them to old people?
When you see the ways in which our aged are disavowed, mocked, insulted, neglected, and abused it's pretty evident that there is something fundamentally wrong with attitudes of the (mostly) young.
What is `dirty' about an old man with sexual urges towards a young woman? At exactly what age does it cease to be clean? As both of these characters were above the age of majority they were surely free to choose their own lifestyles for themselves. In fact, the young woman here was a blatant abuser, but we learn, as the movie progresses, that she has herself been abused, and eventually grows to regret the treatment she has metered out.
As a measure of how perverse our culture has become; if these two people had been homosexual; most of the critical comments posted here could constitute a criminal offence. It's long past time that the elderly enjoyed the same statutory protection.