Body composition starts to change as early as the 30s. As people age, they tend to lose muscle mass, while fat content increases. Alcohol isn’t distributed in fat. People also have less total body water as they get older. So if several people have the same amount to drink, those with more fat and less muscle and body water will have more alcohol circulating in their bloodstream. (This is also partly why women of any age tend to feel alcohol’s effects more than men.)
“A lot of older people are borderline dehydrated. They have less body water just from the natural effects of aging,” Dr. Blackwelder says. It helps to drink water and have a full stomach when knocking one back.
Read more online at WSJ http://online.wsj.com/news/articles/SB10001424052702304439804579205913000870266