The best way to know what your VO2max is, is to do a real VO2max test hooked up to a metabolic cart at a lab. This is valuable information because large-scale studies (10,000 test subjects) have been done to collect enough VO2max data to stratify by gender and age. Here is one such study, notably done using cycle ergometers, so most relevant to people here:
Reference values for peak oxygen uptake: cross-sectional analysis of cycle ergometry-based cardiopulmonary exercise test
The authors of this study even created a handy-dandy online tool where you can specify your age and lab-tested VO2max, and see how you stack up relative to the general population of people your age.
https://vo2peak.shinyapps.io/vo2peak_calculator/
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