It is a momentary structure that arises and passes away from moment to moment and in the case of any given individual this process can occur from moment to moment for a hundred years.
This is true both at the atomic level, and at the psychological level.
As I said I have no wish to convert anyone to my view.
I think its worth putting on record the fact that there are a number of interpretations..
And to once more direct those interested to the work of Ajahn Buddhadasa, To my mind the greatest Theravadin thinker of our age.