Let's suppose there can be 999,999,999 social security numbers possible without reusing any numbers (which they say they will never do. There are nearly 300,000,000 people in the USA right now, which uses up almost 1/3 of the numbers. Since the system started, I bet 100,000,000 people have died. this leaves about 600,000,000 numbers possible to use. All things considered, they will be used up in 1 or maybe 2 generations. Imagine that every computer software needs to be changed to add one or 2 extra digits!?! That would be far worse than any Y2K worries..... And telephone numbers! we will have to add another digit or 2 to them pretty soon, again, unbelievable disruption in all software that has to be replaced. Thoughts?