RE: Define
An interesting question. It's easy to know if someone is a beginner, but when does one become 'advanced," and are there different levels of 'advanced?'
I definitely think one can be advanced in several areas and not in others. And that there are different levels of "advanced." (Some workouts are 'very advanced' or 'super advanced' IMO!)
I don't go by labels, because it can vary from one type of workout to another and between different skills. If you can do a workout, you can do it. If you need to modify it to do it, then modify it.
Collage used to state that beginner/intermediate/advanced was based on how long you've been working out and how regularly, but someone could work out often, and have been working out for a long time, and still not do 'advanced' workouts.
I usually enjoy workouts labelled 'advanced'(unless that refers to the choreography: I'm no choreo hound!), or intermediate/advanced. Some 'advanced' workouts are too high impact for my body, but does that make me less advanced (or just wise in listening to my own limitations)? I may do them, but with modifications (maybe 'advanced' can also apply to knowledge, skilll and ability to adapt?) .
Compared to the majority of Americans, I'm sure you are 'advanced." Compared to some Catheites, maybe not so much (but they may be "super advanced"!).