She's 77, but she does look very good for her years. Remember the Queen Mum, who broke her leg at age 98 or 99 as I recall, and was back in high heels(!), walking with a cane, at 100. Must be the genes.
Didn't Laura commit a minor faux pas by offering a gloved hand to the Queen? Not enough to worry about, and QE2 didn't seem offended, so no worries. And the pics sure seemed to demonstrate genuine respect between the Bushes and the royals.