Why don't you get in touch with Apple support and ask them about this? They are very helpful on the phone and will arrange to call you back so it won't cost you anything.
I started to set up a query then thought it would look odd if I was actually asking on behalf of other GNs (I am able to enter the correct year of my birth). When you get a reply, I'd be really grateful if you could post it on here, it may help others.
Scottish island ferries debacle. 🏴