There has been a good deal of research connecting low B12 levels in the elderly to confusion, depression and apparent senility -  one of my very favorite nutritional physicians, Dr. Jonathan Wright, cites the case of an older woman whose confusion, depression and forgetfulness had caused her to be referred to a psychiatrist: but who responded 100% to injections of B12. He tells of a study of 228 residents in a nursing home, with an average age of 87. Despite good diets, and supplementation, 39% were deficient in one or more vitamins: most commonly B6, followed by Niacin and B12.

Its importance for cardiovascular health is also well-known.  Now it would appear that a B12 deficiency is actually part of the over-all frailty that afflicts some elderly people.

Vitamin B12 Deficiency May Contribute to Frailty in Elderly Women

Remember, anyone whose health problems suggest deficiencies of B12,  would do well to consider a possible HCL deficiency as the cause.  The symptoms of too little and too much stomach acid are almost identical, and rushing to take antacids will make a bad situation worse.

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 Digestion- the Vitamin Lady writes about  solving digestive problems naturally