Option to only show people without both dates in date game

[Sjoerd de Bruin]

I think a option to only show people without both dates would speed up the proces in the date game. A lot of new items don't show up because of the "false positives".

[Rupert Clayton]

Yes, it would be helpful to have an option to exclude people with an existing "date of birth" property that is more recent than a particular date (e.g. 1950/01/01). Almost all these entries are for living people.