While I appreciate the idea, and I generally don’t think it’s a bad one (personally I prefer maybe a coffee interview, some of the best jobs I have had had a more casual conversation like this).

I worry about the potential for figuring out someone’s age or just if someone doesn’t drink.

I will never forget being offered a beer in an interview before I was 21. I refused without stating my age (I still got the job) but it was a bit of an awkward situation. For the record this was a tech job.