While that certainly is a direction that things could go if you took this to an absurd level, places can already ban kids buy doing lots of things related to al

While that certainly is a direction that things could go if you took this to an absurd level, places can already ban kids buy doing lots of things related to alcohol and smoking in many jurisdictions. Doing it outright doesn't really change much other than the liquor license requirement. Not to mention: This isn't a ban on children, merely children under 6.