Because according to a just conducted analysis by NerdWallet, looking at the future of the average recent college graduate, and more importantly looking at the mountain of student loans each graduate will be saddled with and the implications for the earliest possible retirement age onset, Millennials may well have no choice but to postpone their retirement by about a decade, to the ripe old age of 73.

The reason for this, of course, is the magic of compounded interest: that "manageable" debt load grows and grows and grows even assuming one dutifully pays interest on time. And with unemployment at graduation running at 18%, that is a rather generous scenario. Still, even under base case assumption, the median student loan of $23,300 will end up costing students over $115K by the time they retire.