[mikekchar]

Keep in mind that this was a study of 60 individuals all in the same old age home. I haven't read the study (just the abstract), but it seems possible to me that the study is biased by having selected the participants based on the results rather than as a random sample. For example, let's say I look at 1000 old age homes and find one in which all the residents are healthier than other old age homes. Then I find some unusual behaviour in the old age home and attribute that to the increased health. This is classical biased sampling.

It's like looking at all the classrooms in the US and picking the one with the best grades. Then noticing that there is a higher than normal occurrence of the letter "M" in the students' names. Finally we conclude that using the letter "M" in your child's name will lead to a better outcome in their schooling.

Like I said, I haven't read the paper, but I've seen so many similar studies with biased sampling (or with absolutely no mention of their sampling techniques) that I'm highly suspicious.

While it is interesting (and possibly merits further study), I don't think you will find an answer to your question in your lifetime, unfortunately. Experiments that would provide good results will take a long time, if they are ever even attempted.