Heart Failure Support Group
Heart failure is a condition that can result from any structural or functional cardiac disorder that impairs the ability of the heart to fill with or pump a sufficient amount of blood throughout the body. It is often undiagnosed due to a lack of a universally agreed definition and difficulties in diagnosis, particularly when the condition is considered "mild."
hugs,Raoul
i'm not sure if it would help otherwise, since, the study was only done on people with those features. for example, maybe deficiencies are only present in those age ranges in the first place.
just offering my opinion. :)