1) On the actor's page, when the person's details are unknown, instead of "Birthday: unknown" etc. just hide those fields. Like the death date is hidden now. When there's no details set, in the Person Info box could be a prompt to add missing info.
2) Add one more field, something like "Working in" or "Lives in". There are many actors, who were born in one country, but grown up, live and work in another. E.g. the Tanzania-born actress, who lived her whole life since early childhood in US is an American actress, not Tanzanian.



