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Number of Glioma Patients (With Glioma Grade and Subtype) per Age Group, y The majority (77%) of gliomas after age 40 years were grade IV glioblastoma, which occurred in only 12% of adults younger than 40 years. The majority (68%) of gliomas in patients ages 20 to 39 years were grades II/III. The majority (60%) of gliomas in patients ages 0 to 19 years were grade I pilocytic astrocytomas. Unspecified gliomas are excluded.
