Such is Hollywoodâ€™s aversion to anyone growing old, films with leading grandparent roles are few and far between.
After all, weâ€™re all supposed to be getting younger and itâ€™s never been exceptional for people around 60 to become grandparents.
Parental Guidance is a variation on Home Alone, with grandparents Artie Decker (Billy Crystal, 64) and Diane (a still livewire Bette Midler, 67) arriving to look after her daughterâ€™s three children while the parents go away.
So, getting used to the way things work and the fact that gadgets might even speak to you, is going to be a challenge for the Deckers.
Thereâ€™s also a good, modern subtext too, about how you should bring up and, indeed, teach, young children today.
I donâ€™t know if itâ€™s reassuring or scary that in such an American film the kids seems to be UK-style victims of both health and safety rules and political correctness at the same time.
For the Deckers, thereâ€™s also the problem of whether to even go.
Which set of grandparents are the childrenâ€™s favourites?
Funnier than Little Fockers (2010), thereâ€™s no reason why Parental Guidance canâ€™t go on to have its own sequel, with the other set of grandparents coming into the equation.
For anyone wanting an escapist, family movie, Parental Guidance is just the ticket.
The U certificate also means that grandparents can safely take their own second generation little ones on a trip to the cinema.
We donâ€™t see that often enough and that is partly because there arenâ€™t the films to encourage this pattern.
Parental Guidance is the perfect excuse. If youâ€™ve got grandchildren â€“ give them an end-of-holiday treat.