For years, the Yankees would build around the "Core Four" and patch holes at every other position.
Last year marked the end of Andy Pettitte's historic career, as well as Jorge Posada's last season catching. 2010 also saw Derek Jeter hit for the lowest batting average of his career—.270.
The only man in the group seemingly unfazed by age is the 41-year-old Mariano Rivera, although last year he did pitch for the second fewest number of total innings in his 17-season career.
Let's forecast the future of the Yankees, and see how they've set themselves up for life after the "Core Four."