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Background and Purpose: Parkinson's disease (PD) is an age‐related condition characterized by substantial phenotypic variability. Consequently, pathways and proteins involved in biological aging, such as the central aging pathway comprising insulin‐like growth factor 1–α‐Klotho–sirtuin 1–forkhead box O3–peroxisome proliferator‐activated receptor γ, may potentially influence disease progression. Methods: Cerebrospinal fluid (CSF) levels of α‐Klotho in 471 PD patients were examined. Of the 471 patients, 96 carried a GBA1 variant (PD GBA1), whilst the 375 non‐carriers were classified as PD wild‐type (PD WT). Each patient was stratified into a CSF α‐Klotho tertile group based on the individual level. Kaplan–Meier survival curves and Cox regression analysis stratified by tertile groups were conducted. These longitudinal data were available for 255 patients. Follow‐up times reached from 8.4 to 12.4 years. The stratification into PD WT and PD GBA1 was undertaken to evaluate potential continuum patterns, particularly in relation to CSF levels. Results: Higher CSF levels of α‐Klotho were associated with a significant later onset of cognitive impairment. Elevated levels of α‐Klotho in CSF were linked to higher Montreal Cognitive Assessment scores in male PD patients with GBA1 mutations. Conclusions: Our results indicate that higher CSF levels of α‐Klotho are associated with a delayed cognitive decline in PD. Notably, this correlation is more prominently observed in PD patients with GBA1 mutations, potentially reflecting the accelerated biological aging profile characteristic of individuals harboring GBA1 variants. [ABSTRACT FROM AUTHOR]