Well, I think there's a bit of cultural flexibility in this. 19 would piss me off and probably annoy most Brits, I've tried which doesn't really work for me. Although 22 seems to be okay for the most part. Will have to remember to try the rest.
Great now I can let visitors and grandkids have access, but I really have no trust issues with either. The security info is worth a look. Someone can park on the street and access your system via WiFi.