One of my older buddies, a 74-year-old, fitness-conscious fellow, when asked how he’s doing, often responds, “I’m keeping it tight,” which always gives people a laugh. Amusing as it is to hear the phrase coming out of a septuagenarian’s mouth, his goal of keeping trim, with as much muscle as possible, is a serious one – and one we all should shoot for, no matter what age we are. The challenge with muscle mass is that after the age of 40, it starts to decline at roughly 1% a year. At 50, the decline picks up additional speed (yikes!).