This is an interesting and unusual result. The result shows that LDL in specific is inversely associated with mortality in the elderly.
High LDL-C is inversely associated with mortality in most people over 60 years. This finding is inconsistent with the cholesterol hypothesis (ie, that cholesterol, particularly LDL-C, is inherently atherogenic). Since elderly people with high LDL-C live as long or longer than those with low LDL-C, our analysis provides reason to question the validity of the cholesterol hypothesis.
Should we question the cholesterol hypothesis? Of course mortality in specific doesn't necessarily mean caused by heart disease and people might simply die of other diseases.