To be pedantic, "date of birth" does not actually imply "age". At the very least you need "instant of birth" instead, since dates are subject to calendars and time zones. Also Feb 30th happened in 1712 in Sweden; beware of modelling a domain so tightly that you leave some of it unmodelled (cough email-address validation regexes).
To be pedantic, "date of birth" does not actually imply "age". At the very least you need "instant of birth" instead, since dates are subject to calendars and time zones. Also Feb 30th happened in 1712 in Sweden; beware of modelling a domain so tightly that you leave some of it unmodelled (cough email-address validation regexes).