The main question being asked in this study is: **How do allostatic load and cognitive ability relate over time?**
Specific questions being asked in this study are:
- Does initial [age ~70] allostatic load relate to subsequent change [between ages ~70 and ~79] in general and domain-specific cognitive abilities?
- Do initial general and domain-specific cognitive abilities relate to subsequent change in allostatic load?
- Does change in allostatic load correlate with change in general and domain-specific cognitive abilities?
- Does age 11 cognitive ability predict allostatic load at age ~70 and change in allostatic load between ages ~70 and ~79?
- Does statistically controlling for the effects of age 11 cognitive ability affect the contemporaneous and longitudinal relationships between older age allostatic load and older age cognitive ability?