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Indeed. This really isn't my area, and unfortunately the original study is not open access, but there are some conflicting statements in Guardian article:
"They ... compared lifespan for the most optimistic with the least, taking into account factors including age, sex, race, education, depression and other health conditions present at the outset", but also
"Most of the participants in the study were white, and few had low socioeconomic status – meaning more research is needed to see if the findings hold in other groups".
JoePablo
hamrack
On the other hand, if you're an orphan living in poverty with 6 degenerative diseases, you will probably a) be a pessimist b) die relatively young, and the pessimism isn't really your main problem