PBS will air a documentary on Robert E. Lee on Monday, Jan.3, 2011 at 9:00 PM.
Notice the physical changes in his appearance as he aged, and also as the was affected by the stress of war. The two images furtherest to the right could be as close together as 6 months but are most likely a few years apart (maybe as much as 10-15 years). I had the opportunity to review a preview copy recently. Here's my review: