**Figure 5.** **Examples of different trajectories for changes in correlations with age. **(**A**) Hematocrit vs. total calcium. Example of a correlation that decreases with age but remains positive. (**B**) Standing height vs. systolic blood pressure. Example of a correlation that decreases with age, starts positive and ends negative. In red, we replicated the analysis on the UK Biobank cohort. (**C**) Percentage of segmented neutrophils vs. number of lymphocytes**.** Example of a correlation that decreases with age and remains negative. (**D**) Hematocrit vs. chloride. Example of a correlation that increases with age but remains negative. (**E**) Percentage of segmented neutrophils vs. creatinine. Example of a correlation that increases with age, starts negative and ends positive. (**F**) Chloride vs. sodium. Example of a correlation that increases with age and remains positive.