Keywords Humans, Medulloblastoma, Neuroectodermal Tumors, Primitive, Central Nervous System Neoplasms, Survivors, Cerebellar Neoplasms, Epigenesis, Genetic, Epigenetics, aging, survivorship, PNET, medulloblastoma Abstract Survivors of childhood central nervous system (CNS) tumors experience early-onset aging-related phenotypes. DNA methylation (DNAm) age is an emerging epigenetic biomarker of physiologic age and may be predictive of chronic health conditions in long-term survivors.