I once saw a film with a young boy, (I believe the directors grand son).
where this boy is running around a park talking to elderly  people.
He asks them if they will be at the same park bench next week, next year, 10 years.
one of the elderly says " oh I don't think so, I will be very old by then" and the 
little boy says "it could happen" I believe the title translated means " It could happen"
I dont know what language or country or director.
any help would be greatly appriciated, I love this film and would like to find it.
thanks