And? Do you think smoking became all of the sudden healthy again over the last 50 years since they discovered it is a main cause for cancer? Unless there is a reasonable expectation that things have changed, studies are valid and do not get invalidated by age.

Considering that a decent study might take easily a year to run and another year to get through the peer review process, 10 years are actually rather recent. I've seen papers (although in a different field) that in 2013 describe discoveries from the late 199x as "recent".