What will happen to the lens in presbyopia and why does it happen?

Presbyopia: The flexibility of the natural lens inside our eye declines with age. This flexibilty of the lens allows the lens to change shape and focus or "accommodate" on near objects. As it declines typically.... in the 40's it starts to affect reading and computer vision. The loss of accommodation is predictably worse every two years or so until around age 65 where the lens has minimal to no accommodation