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In this video:
Gerontologist and author of A New Wrinkle: What I Learned from Older People Who Never Acted Their Age, Dr. Eric Shapira, says it is difficult to pinpoint the cause or one main reason for the smell; it is a process of what happens to the body as we age. Many studies show that the body’s chemistry changes from within as we get older producing a certain scent. Some may describe it as musty. Some may call it stale. Maybe a bit medicinal.
Want the text version?: http://www.todayifoundout.com/index.php/2013/11/old-people-really-smell/