Analogously, assessing only patients from the United States, the Ashkenazi Jewish ancestry group still had an older AAO than the European ancestry group (HR = 0.51, 95% CI = 0.39-0.67, p = 1.3 × 10<sup>-6</sup>).<h4>Interpretation</h4>Our results provide evidence that a person's genetic ancestry and country of origin are associated with the AAO of LRRK2-PD. Here, LRRK2 is linked to Parkinson disease.