I do understand that those on an official list, who haven't had their call yet, are getting frustrated when they hear about young people getting vaccinated before them. But honestly I don't think vaccinating at random in the younger age groups (those not on the priority lists) would be a big problem. We don't have a clear picture of who is at higher risk in those age groups (outside of those with certain medical conditions), so vaccinating at random is just as likely to get the right people as going through them in order. Plus the current "lets call someone nearby" approach seems to get a lot of school and shop staff, who are at higher risk of exposure to the virus, and also more likely to be a significant multiplicator, if they were ill.