ObjectiveTo evaluate the impact of age on oncological outcomes in a large contemporary cohort of patients with non‐muscle‐invasive bladder cancer (NMIBC) treated with adequate Bacillus Calmette–Guérin (BCG).Patients and MethodsWe performed an Institutional Review Board‐approved retrospective study analysing patients with NMIBC treated with adequate BCG at our institution from 2000 to 2020. Adequate BCG was defined as per United States Food and Drug Administration (FDA) guidelines as being receipt of at least five of six induction BCG instillations with a minimum of two additional doses (of planned maintenance or of re‐induction) of BCG instillations within a span of 6 months. The study's primary outcome was to determine if age >70 years was associated with progression to MIBC cancer or distant metastasis. The cumulative incidence method and the competing‐risk regression analyses were used to investigate the association of advanced age (>70 years) with progression, high‐grade (HG) recurrence and cancer‐specific mortality (CSM).ResultsOverall, data from 632 patients were analysed: 355 patients (56.2%) were aged ≤70 years and 277 (43.8%) were >70 years. Age >70 years did not adversely affect either cumulative incidence of progression or HG recurrence (P = 0.067 and P = 0.644, respectively). On competing‐risk regression analyses, age >70 years did not emerge as an independent predictor of progression or HG recurrence (sub‐standardised hazard ratio [SHR] 1.57, 95% confidence interval [CI] 0.87–2.81, P = 0.134; and SHR 1.05, 95% CI 0.77–1.44, P = 0.749). Not unexpectedly, patients in the older group did have higher overall mortality (P < 0.001) but not CSM (P = 0.057).ConclusionAge >70 years was not associated with adverse oncological outcomes in a large contemporary cohort of patients receiving adequate intravesical BCG for NMIBC. BCG should not be withheld from older patients seeking for bladder sparing options.