Hardy har har. It's just natural shrinkage for old guys. Women do it twice as fast they say. When we got married, the wife was 6'2" and when she ordered a new cape last fall she didn't even hit 6 feet. Still stands straight and tall and the LOTR freaks do double takes thinking she's the elf queen or something.
Here's a quick quote - Short answer: yes, and it occurs even more rapidly in the elderly. Women lose an average of two inches between age 30 and 70, but then the process speeds up a bit. By age 80, most women will have shrunk a total of three inches.