Testing such aging clocks as potential predictors of incident PD may provide novel cost-effective tools for assessing neurodegenerative risk at the population level, and looks promising in view of previous associations of PD with several markers commonly assessed in blood tests, such as platelet parameters (peculiarly mean platelet volume and platelet distribution width) (14), and inflammatory markers like C-reactive protein levels (15) and neutrophil-to-lymphocyte ratio (16). This evidence concerns the gene CRP and Parkinson disease.