das Geburtsdatum
date of birth
The exact date (day, month, and year) on which a person was born.
Bitte tragen Sie Ihr vollständiges Geburtsdatum in das Formular ein.
Please enter your full date of birth on the form.

date of birth
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date of birth
The exact date (day, month, and year) on which a person was born.
Bitte tragen Sie Ihr vollständiges Geburtsdatum in das Formular ein.
Please enter your full date of birth on the form.

The word is made up of 'Geburt' (birth) and 'Datum' (date), connected by an 's'. It literally means the 'date of birth'.
Auf dem Formular müssen Sie Ihren Namen und Ihr Geburtsdatum angeben.
On the form, you have to provide your name and date of birth.
'Geburtsdatum' is often used with the verbs 'angeben' (to provide), 'eintragen' (to enter), or 'nennen' (to state/name), especially in official contexts such as on forms or when dealing with authorities.
Können Sie mir bitte Ihr Geburtsdatum nennen?
Could you please tell me your date of birth?
This word belongs to formal and official language. You mainly find it on documents, in forms, and in contact with government offices or institutions.
Für die Anmeldung benötigen wir einen Nachweis über Ihr Geburtsdatum.
For registration, we need proof of your date of birth.
age
'das Alter' and 'das Geburtsdatum' both describe information about a person and their birth, but they do not mean the same thing. 'das Alter' says how old someone is. 'das Geburtsdatum' gives the exact day, month, and year of birth. The words are especially easy to confuse in forms or registrations. If the question is 'Wie alt sind Sie?' (How old are you?), you give your age. If the question is 'Geburtsdatum?' (date of birth?), you write a date.

Auf dem Formular fehlt noch das Geburtsdatum von Frau Wagner.
Mrs. Wagner's date of birth is still missing on the form.
Für den Kurs muss sie ihr Alter angeben.
She has to provide her age for the course.