Glioblastoma (GBM) is the commonest primary malignant brain tumour among the adult population. Incidence peaks in the 7 th and 8 th decades of life and as our global population ages, rates are increasing. GBM is an almost universally fatal disease with life expectancy in the range of 3-5 months amongst the elderly.The assessment of elderly GBM patients prior to treatment decisions is poorly researched and unstandardized. In order to begin tackling this issue we performed a cross-sectional survey across all UK based consultant neuro oncologists to review their current practice in assessing elderly GBM patients.There were 56 respondents from a total of 93 recipients (60% response rate). All respondents confirmed that at least some patients aged 70 or over were referred to their clinics from the local multidisciplinary team meeting (MDT). Only 18% of consultants routinely performed a cognitive or frailty screening test at initial consultation. Of those who performed a screening test, the majority reported that the results of the test changed their treatment decision in approximately 50% of cases. Participants ranked performance status as the most important factor in determining treatment decisions.Considering the heterogeneity of this patient population, we argue that performance status is a crude measure of vulnerability within this cohort. Elderly GBM patients represent a unique clinical scenario because of the complexity of distinguishing neuro oncology related symptoms from general frailty. There is a need for specific geriatric assessment models tailored to the elderly neuro oncology population in order to facilitate treatment decisions.